This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nutrition and health, Subject name: Social & Preventive Medicine
Vitamin A deficiency is considered a public health problem if prevalence rate of night blindness in children between 6 months to 6 years is more than - 
Select and explain. 
A. 0.01%, B. 0.05%, C. 0.1%`, D. 1.00%
D: 1.00%
Answer: D: 1.00% 
Explanation: - night blindness or inability to see in dim light is a manifestation of vitamin A deficiency. - Vitamin A deficiency is considered a public health problem if prevalence rate of night blindness in children between 6 months to 6 years is more than 1 percent. Reference : Park's textbook of preventive and social medicine, 23rd edition, pg no:616 <\p>