请不要离开本题。

Please keep [stick] to the point.; Please don't stray from the subject.

你说的与本题无关。

What you said is irrelevant to the subject.

那个问题与本题无关，没有必要回答。

That question is beside the mark and needs not to be answered.

他所说的话与本题没有多大关系。

What he said has not much bearing on the subject.

本题承销期限为100天，是不符合规定的。

In this question, underwriting period is 100 days. So it is wrong.