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': 'Galactorrhoea due to ectopic prolactin is seen in  a) Malignant thymoma  b) Bronchogenic carcinoma  c) Medullary carcinoma thyroid  d) Hypemephroma \nSelect and explain. \nA. abc, B. bd, C. bcd, D. cd', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]