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
For every 100 kilocalories, vitamin B, required is - 
Select and explain. 
A. 0.05 mg, B. 0.5 mg, C. 5.0 mg, D. 1.0 gm
A: 0.05 mg
Answer: A: 0.05 mg 
Explanation: parks textbook of preventive and social medicine 23rd edition. *recommended intake of thiamine for every 1000kcal intake of energy is 0.5mg . so for 100 kcal intake of energy ,thiamine requried is 0.05 mg .