This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Disorders in Menstruation, Subject name: Gynaecology & Obstetrics
[{'content': 'Prepubertal PCOS, risk factors are all except \nSelect and explain. \nA. Increased birth weight, B. Premature Adrenarche, C. Obesity with acanthosis nigricans, D. Atypical sexual precocity', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. is a, i.e. Increased birth weightRef: Williams gynae 3rd/ed, p397Risk factors for PCOS in ad descent girls* Low birth weight* Premature adrenarche* Obesity with acanthosis nigricans* Atypical sexual precocity', 'role': 'assistant'}]