This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Social & Preventive Medicine
Body content of thiamine is: 
Select and explain. 
A. 5 g, B. 6 g, C. 20 g, D. 30 g
D: 30 g
Answer: D: 30 g 
Explanation: Body content of thiamine is placed at 30 mg and if more than this is ingested, it is merely lost in urine. Ref: Park 22nd edition, page 572