This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous (Gynae), Subject name: Gynaecology & Obstetrics
[{'content': 'The weight of placenta at term is \nSelect and explain. \nA. 250 gm, B. 500 gm, C. 7500 gm, D. 1000 gm', 'role': 'user'}, {'content': 'Answer: B \nExplanation: (500 gm): Ref: 29-D, 23-H & BPlacenta at term. The mature placenta is a Fleshy, discoid organ weighing about 500 gm usually weighing about 1/6 of the fetal weight. It is about 20 - 25 cm in diameter and 2.5 cm thickness at term, about four-fifths ofplacenta is of fetal origin.', 'role': 'assistant'}]