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
[{'content': 'Which is first and commonest clinical manifestation of Epidemic dropsy – \nSelect and explain. \nA. Bilateral swelling of legs, B. Gastrointestinal upsets, C. Cardiac decomposition, D. Sarcoid', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]