What begins with T, ends with T, and has T in it?

There was once a college that offered a class on probability applied to the real world. The class was relatively easy, but there was a catch. There were no homework assignments or tests, but there was a final exam that would have only one question on it. When everyone received the test paper it was a blank sheet of paper with a solitary question on it: 'What is the risk?'.Most students were able to pass, but only one student received 100% for the class! Even stranger was that he only wrote down one word!
What did he write?

What is harder to catch the faster you run?

Can you make a six-letter word using the letters N, A and B ?

What part of the chicken has the most feathers?

10+10 and 11+11 can give you the same answer.

Explain how?

The answer I give is yes, but what I mean is no. What was the question?

You bought me for dinner but never eat me. What am I?

A word I know,
Six letters contain,
Subtract just one,
And twelve is what remains.

Teacher ask the student

'Why are you standing on that chair in music class ?'.

what did student replied ?