This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: vitamins, Subject name: Biochemistry
RDA of thiamine per 1000 kcal energy per day is 
Select and explain. 
A. 0.5 mg, B. 0.6 mg, C. 0.7 mg, D. 0.8 mg
A: 0.5 mg
Answer: A: 0.5 mg 
Explanation: RDA of thiamine per 1000kCal energy per day is 0.5mg.Recommended Daily Allowance of Thiamine It depends on calorie intake (0.5 mg/1000 calories). Requirement is 1-1.5 mg/day. Thiamine is useful in the treatment of beriberi, alcoholic polyneuritis, neuritis of pregnancy and neuritis of old age.Reference: Textbook of Biochemistry by D M Vasudevan, sixth edition, pg no. 392