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
[{'content': 'The highest incidence of gestational trophoblastic disease is in: \nSelect and explain. \nA. Australia, B. Asia, C. Noh America, D. Western Europe', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The incidence varies according to ethnic differences being more common among Asians than in caucasians.The maximum incidence is seen among Orientals.There is increased incidence in women at the extremes of reproductive age ,especially in women above 35.(refer pgno:169 sheila obstetrics 2 nd edition)', 'role': 'assistant'}]