Night blindness is caused by the deficiancy of

Answer: Option A

Night blindness is caused by the deficiency of Vitamin-A.
Night blindness is the difficulty for the eyes to adjust to dim light. Affected individuals have poor vision in the darkness but see normally when adequate light is present.
Vitamin A deficiency (VAD) or hypovitaminosis A is a lack of vitamin A in blood and tissues.
Vitamin A deficiency is the most common cause of blindness in developing countries. The WHO estimated in 1995 that 13.8 million children had some degree of visual loss related to VAD.