"Extending the above analogy, can I say that,this question exists but
no questioner is found?"
Yes.
"Can I also say that, choice to answer this question exists but no
choice maker will be found?"
Yes.
"If you answer the above questions then haven't you yourself made the
choice ?"
Yes.
Now I ask:
Is there an I (a choice maker) that made the choice?
No.
Is there a choice?
No.
Is there a question?
No.
How could that be?!
Firstly there is an I, there is a choice and there is a question. Secondly, there is no I, no choice and no question.
How could that be?!
With decision (volition) there arises the I. With decision (volition) there arises the choice. With decision (volition) there arises the question.
That which arises with decision (volition) is not truth ... is like a dream ... like a lie.
It is like taking clay and forming a vase claiming "This is a vase", and not seeing that it is not a vase but just clay.
How can I prove that?
I cannot.
How can I explain it to you so that you will see this?
I cannot.
It is like you asking me "What is below the basement of my house?" and me replying "There is immense gold. Hundreds and thousands of gold, emeralds, coins. Tons and tons and tons! So immense in value that the whole universe could be made wealthy with it!" and you not even digging under your house to check my claims.
How can I explain what the "clay" is?
I cannot.
It is like you asking me "What is the taste of this fruit?" and me replying "Delicious! Soo good!" and you not even taking a bite to taste the fruit yourself to see the taste yourself.
EDIT:
Prajñāpāramitā sutra:
"You should look upon
everything as an illusion, a transformation, a dream, a
bubble, or a shadow — as unreal."
"Subhåti, all dharmas are spoken of as no dharmas. Therefore they are
called dharmas."
Source: http://www.buddhanet.net/pdf_file/prajparagen2.pdf
Diamond sutra:
"A shooting star, a clouding of the sight, a lamp, An illusion, a drop
of dew, a bubble, A dream, a lightning’s flash, a thunder cloud—This
is the way one should see the conditioned."
https://hyanniszendo.files.wordpress.com/2011/09/diamondsutra_lettersize1.pdf
When I read the above, "everything" and/or "conditioned" I understand as everything that is experienced with the senses.
If you look at dependent origination https://en.wikipedia.org/wiki/Prat%C4%ABtyasamutp%C4%81da#/media/File:Paticca-Samuppada.JPG, "everything" and/or "conditioned" arises from volitional activities (activities).
Thus, you get this statement:
"That which arises with decision (volition) is not truth ... is like a dream ... like a lie."
Be careful. I with the above statement do not imply that everything is not real. Nor do I imply that everything is real. Nor do I imply that something is real and something is not real, nor any combination of real/unreal. I know it doesn't make sense, but I think it is understandable enough for you to move you in the right direction. You must see it yourself.
For there is suffering, but none who suffers; Doing exists although there is no door [sic]. Extinction is but no extinguished person; Although there is a path, there is no goer.
" So far as I can see, Ven. Thanissaro hasn't published a translation (of the Visuddhimagga).