Night blindness is caused due to deficiency of

Explanation:

Night blindness is caused due to deficiency or lack of Vitamin A intake in the diet.

In this disease, it becomes relatively difficult and gradually impossible to be able to see in low light conditions.

It is caused due to deficiency of Vitamin A in the blood and plasma of the body and is diagnosed in pregnant women belonging to developing nations.

Final Answer:

Hence, the correct answer is option B: Vitamin - A.