Answer:
Is
Step-by-step explanation:
He asked is Ali a doctor.
hope it helps .... keep smiling
edit : If the noun is singular, use is. If it is plural or there is more than one noun, use are. The cat is eating all of his food
You use if in conditional sentences to introduce the circumstances in which an event or situation might happen, might be happening, or might have happened.
She gets very upset if I exclude her.