This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Pediatrics
[{'content': "Gynecomastia in neonate is seen due to: \nSelect and explain. \nA. Mother's estrogen, B. Mother's progesterone, C. GnRH, D. Gonadotropins", 'role': 'user'}, {'content': "Answer: A \nExplanation: a. Mother's estrogen(Ref: Nelson 20/e p 2742)Transient gynecomastia occurs in 60-90% of male newborns secondary to exposure to estrogens during pregnancy.Breast development may be asymmetrical and galactorrhea is seen in 5%.Most cases resolve within 4-8 wk of birth, but a few can last as long as 12 mo.", 'role': 'assistant'}]