Question

His father deals in cloth make question

Answer 1

What does his father deal with ?

Answer 2

Answer:

What does his father deal in/with?

Or,

His father deals in cloth, doesn't he?

Explanation:

The given answer is in the form of a statement. This can be converted into a question form by changing it into an interrogative form.

This can be done very carefully as follows:

What does his father deal in?

In this form we can see that "does" has been used as "father" is singular noun and we have done nothing but changed the form of this line. Another way by which we can do this is by adding a question tag.

Then it will be:

His father deals in cloth, doesn't he?