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': 'Recommended Dietary allowance in pregnancy are \nSelect and explain. \nA. +100-300 cal, B. 30 mg Iron, C. 4 mg folic acid, D. 2500 mg Mg', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. is b i.e. 30 mg Iron', 'role': 'assistant'}]