This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General obstetrics, Subject name: Gynaecology & Obstetrics
Lowest frequency of twin pregnancy is seen in: 
Select and explain. 
A. Nigeria, B. Philippines, C. India, D. Japan
D: Japan
Answer: D: Japan 
Explanation: <p> Lowest frequency of twin pregnancy is seen in Japan(2/1000). Reference:Textbook of obstetrics,Sheila Balakrishnan,2nd edition,page no:178. <\p>