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': 'Second degree of under nutrition means – \nSelect and explain. \nA. Weight below 50% of the harvard standard, B. Weight below 60% of the harvard standard, C. Weight between 60% & 81% of the harvard standard, D. Weight between 60 % & 71% of the harvard standard', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]