This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Medical, surgical and gynaecological illness complicating pregnancy, Subject name: Gynaecology & Obstetrics
[{'content': 'Total amount of iron needed by the fetus during entire pregnancy \nSelect and explain. \nA. 500 mg, B. 1000 mg, C. 800 mg, D. 300 mg', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Iron needs in pregnancy Fetus and placenta 300mg Red cell expansion 500mg Net need in pregnancy 900mg Reference: Textbook of Obstetrics; Sheila Balakrishnan; 2nd edition; Page no: 285', 'role': 'assistant'}]