This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory system, Subject name: Medicine
[{'content': "Small cell carcinoma features are \nSelect and explain. \nA. Commonest malignancy of lung, B. Associated with paraneoplastic syndrome, C. Don't cause SVC syndrome, D. none", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Small cell carcinomas are frequently hilar or central in location,have strong relationship to cigarette smoking and are highly malignant tumours.They are most often associated with ectopic hormone production because of the presence of neurosecretory granules in majority of the tumour cells.Hence they can produce paraneoplastic syndrome.Major hormones produced include ACTH,ADH,Parathormone,Calcitonin,Gonadotropins,Serotonin,etc. Ref Davidson edition23rd pg 614', 'role': 'assistant'}]