This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nutrition and health, Subject name: Social & Preventive Medicine
[{'content': 'Recommended Dietary allowance in pregnancy are - \nSelect and explain. \nA. +100-300 cal, B. 35 mg Iron, C. 4 mg folic acid, D. 2500 mg Mg', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Requirements in pregnancy Pregnancy Proteins +23 g/day Calcium 1200 mg/day Iron 35 mg/day Vitamin A 800mcg/day Ref: Park 25th edition Pgno : 674', 'role': 'assistant'}]