Some human adults are unable to digest milk.

Options

A. due to weak digestive system
B. due to lactose intolerance.
C. due to strong digestive system
D. None of these

Answer

B

Explanation

Some human adults are unable to digest milk because in such persons, the lactose of milk remains indigested and is fermented in the intestine producing gases and acids.
This is due to lactose intolerance because their intestinal juices lack enzyme lactose.