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
Multiple bih are commonest among ...... : 
Select and explain. 
A. Indians, B. Mongol, C. Caucasians, D. Negroes
D: Negroes
Answer: D: Negroes 
Explanation: Negroes