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
The daily requirement of Vitamin C is - 
Select and explain. 
A. 40 mg, B. 100 mg, C. 200 mg, D. 500 mg
A: 40 mg
Answer: A: 40 mg 
Explanation: Requirement of Vitamin C The estimated requirement for vitamin C is 40 mg per day for adults. The normal body when fully saturated contains about 5 g of vitamin C. Ref: Park 25th edition Pgno : 675