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': 'The 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: B \nExplanation: BRONCHIAL CARCINOID AND\xa0OTHER NEUROENDOCRINE TUMOURS\nNeuroendocrine tumours of the lung represent a continuum\xa0spectrum of lung tumours with progressively increasing\naggressiveness which include: typical carcinoid (least aggressive), atypical carcinoid, and large cell endocrine\ncarcinoma, and also small cell carcinoma (most aggressive). All these tumours arise from neuroendocrine (Kulchitsky)\ncells of bronchial mucosa. Formerly, bronchial carcinoids\xa0used to be classified as ‘bronchial adenomas’ but now it is\nknown that they are locally invasive and have the capacity to metastasise. Bronchial carcinoids tend to occur at a\nyounger age than bronchogenic carcinoma, often appearing\xa0below the age of 40 years, and are not related to cigarette\nsmoking.\nCLINICAL FEATURES. Bronchial carcinoids occur at a\xa0relatively early age and have equal sex incidence. Most of\nthe symptoms in bronchial carcinoids occur as a result of\xa0bronchial obstruction such as cough, haemoptysis, atelectasis\nand secondary infection.\xa0About 5-10% of bronchial carcinoids\xa0metastasise to the liver and these cases are capable of\nproducing carcinoid syndrome.', 'role': 'assistant'}]