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: Medicine
[{'content': 'SIADH is associated with - \nSelect and explain. \nA. Small cell carcinoma lung, B. Adeno carcinoma lung, C. Squamous cell carcinoma lung, D. Mixed cell tumor lung', 'role': 'user'}, {'content': "Answer: A \nExplanation: SIDAH is associated with Ectopic vasopressin production by tumors most common cause of SIADH. SCLC and carcinoids are most common source of ectopic vasopressin production Small cell carcinoma of lung Carcinoma of duodenum and pancreas Ewing's sarcoma Thymoma Lymphoma Mesothelioma Carcinoma of bladder Ref - researchgate.net, (Harrison's 17 pg 619).-", 'role': 'assistant'}]