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': 'Increased calories required during pregnancy is (in kcal/ day): March 2004 \nSelect and explain. \nA. 350, B. 550, C. 600, D. 800', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A i.e. 350', 'role': 'assistant'}]