If a student asks a question on some unrelated topic in the class, as a teacher you will

Answering an unrelated question after the class respects the student's curiosity without derailing the lesson.

Allowing unrelated questions during class breaks the flow of the topic.

Not allowing him to ask at all discourages inquiry outright.

Treating it as indiscipline wrongly punishes honest curiosity.

Managing the flow of a lesson while valuing questions balances order and openness.

Curiosity is welcomed but channelled to the right time.