To avoid answering any question in an Interview there are several things that you can say including “I don’t know”

Here are some ideas that can help you:

When you don’t know the answer to a question don’t hesitate and smile and say

I’m not acquainted with it,

I’m not familiar with it,

I am ignorant of the subject,

I am not informed about it,

I have no knowledge of these facts,

I have no idea,

It is unknown to me,

I am unaware of it,

I am groping in the dark with respect to this,

I would like to know too,

I’d pay to know it,

I’m not curious,