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: Pathology
[{'content': 'Following is true about bronchial carcinoids - \nSelect and explain. \nA. Highly radiosensitive, B. Metastasis common, C. Carcinoid syndrome does not manifest, D. Commonly arise from terminal bronchioles', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Carcinoid syndrome does not manifest Bronchial carcinoid o Most patients < 40 years o Not related to smoking o Most tumors are confined to main stem bronchi and commonly project into lumen. Some tumors penetrate the bronchial wall to fan out in the peri-bronchial tissue producing the collar-button lesion. o Most bronchial carcinoids :Do not have secretory activity. Do not metastasize to distant sites (follow a benign course for long periods). Are amenable to resection. o Most common presentation is intraluminal growth which can cause cough, hemoptysis, secondary infections, bronchiectasis, emphysema and atelectasis. o Though very rare, some bronchial carcinoids may also present : i) Carcinoid syndrome ( due to release of vasoactive amines) :- Flushing, diarrhea, cyanosis ii) Symptoms due to metastasis.", 'role': 'assistant'}]