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: Medicine
[{'content': 'All are causes of Gynaecomastia, except \nSelect and explain. \nA. Cimetidine therapy, B. Androgen therapy, C. Leprosy, D. Small cell carcinoma lung', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Even androgen therapy can cause gynecomastia but among all options given in the question, the best answer is androgen therapy.\nSome important causes of Gynaecomastia\n\nLeprosy\xa0\xa0\nTesticular tumours \xa0\xa0\n\nLung cancer - Small cell type \n\nAdrenal disease\xa0\xa0\nLiver disease\nHyperthyroidism\xa0\nHyperprolactinemia\xa0\xa0\nCastration\xa0\xa0\xa0\xa0\xa0\nOrchitis\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\xa0\n\nDrugs -\n\nDigitalis\xa0\xa0\nSpironolactone\xa0\xa0\xa0\nCimetidine \xa0\xa0\xa0\xa0\xa0\nClomiphene \xa0\xa0\xa0\xa0\xa0\nMethyldopa\xa0\nAndrogens\xa0\xa0\nGonadotrophins \xa0\nEstrogens\xa0\nProgesterones\xa0\xa0\xa0\nKetoconazole.\xa0\xa0 \xa0 \xa0 \xa0\xa0\xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0\xa0\xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0\xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0 \xa0\n\nGynecomastia refers to the enlargement of the male breast\nHormone effects\n\nLike the female breast, the male breast is also subject to hormonal influences, and gynecomastia occurs as a result of an imbalance between estrogens which stimulate breast tissue and androgens which counteract these effects.\nUsually, gynecomastia is caused by an estrogen excess and is usually the result of an increased estrogen/androgen ratio, caused by -\nIncreased estrogen\nDecreased androgen\nhCG producing tumours (hCG stimulates Leydig cells to produce estrogen).', 'role': 'assistant'}]