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
Which is first and commonest clinical manifestation of Epidemic dropsy- 
Select and explain. 
A. Bilateral swelling of legs, B. Gastrointestinal upsets, C. Cardiac decomposition, D. Sarcoid
A: Bilateral swelling of legs
Answer: A: Bilateral swelling of legs 
Explanation: Ans. is 'a' i.e., Bilateral swelling of legs