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 – a)  +100–300 calb)  30 mg Iron c)  4 mg folic acidd)  2500 mg Mge)  220 μg Iodine \nSelect and explain. \nA. ab, B. be, C. bc, D. ce', 'role': 'user'}, {'content': 'Answer: B \nExplanation: RDA in pregnancy\n\nEnergy → +350 kcal/d\niron → 35 mg/d\nFolic acid → 500 ug/d\nMagnesium → 310 mg/d\nIodine → 250 µg/d', 'role': 'assistant'}]