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': 'Multiple bih are commonest among . \nSelect and explain. \nA. Indians, B. Mongol, C. Caucasians, D. Negroes', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Negroes', 'role': 'assistant'}]