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': 'Commonest cause of female pseudo hermaphroditism is: \nSelect and explain. \nA. Virlizing ovarian tumor, B. Ovarian dysgenesis, C. Exogenous androgen, D. Congenital adrenal hyperplasia', 'role': 'user'}, {'content': "Answer: D \nExplanation: The most common cause of female pseudohermaphroditism is congenital (virilizing) adrenal hyperplasia (CVAH or CAH). Ref: Harrison's Principles of Internal Medicine, 14th Edition, Page 2124 and 15th Edition, Page 2178 ; Textbook of Gynecology By D C Dutta, 4th Edition, Page 42 ; Transgenderism and Intersexuality in Childhood and Adolescence: Making Choices By Peggy Tine Cohen-Kettenis, Friedemann Pfafflin, 2003, Page 40", 'role': 'assistant'}]