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: Gynaecology & Obstetrics
[{'content': 'Which is more common in primigravida than multigravida : \nSelect and explain. \nA. PPH, B. Placenta pre, C. Malpresentation, D. Hyperemesis', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Hyperemesis', 'role': 'assistant'}]