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
Beri-Beri is caused by - 
Select and explain. 
A. Thiamine, B. Folic acid, C. Riboflavin, D. Niacin
A: Thiamine
Answer: A: Thiamine 
Explanation: - beri beri is due to the deficiency of thiamine. - it has 3 main forms. Dry form characterised by nerve involvement. Wet firm characterised by hea involvement and infantile beri beri. Reference : Park's textbook of preventive and social medicine, 23rd edition, pg no:618 <\p>