I have no option but sit for exam

[Dr.Appalayya]

I have no option but sit for the exam again.
I have no option but sitting for the exam again.

Which of the above two is correct?

 

[volky]

I have no option but to sit for the exam again.

or

I have no option but to take the exam again.

 

[Tabac]

I have no option but to sit for the exam again.

or

I have no option but to take the exam again.

I agree!

 

[vachecow]

It would also be common to say
"I have no option but to retake the exam."

 

[tyler711]

Also, more common in my opinion:
"I have no choice but to retake the exam".

 

[vachecow]

It could be shortened further by saying:
I have to retake the exam.