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': 'Energy requirement in late pregnancy - \nSelect and explain. \nA. 2500 cal, B. 1400 cal, C. 1000 cal, D. 1000 cal', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., 2500 Cal", 'role': 'assistant'}]