This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fetus Placenta & Fetal Membrane, Subject name: Gynaecology & Obstetrics
[{'content': 'Placentamegaly is diagnosed on USG if size of placenta is more near: \nSelect and explain. \nA. 25 mm, B. 30 mm, C. 35 mm, D. 40 mm', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans is d, i.e. 40 mmPlacental thickness increases by 1 mm/week. If placental thickness is more than 40 mm at term, it is called as placentomegaly', 'role': 'assistant'}]