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
Neuroendocrine lesions of lung are - 
Select and explain. 
A. Carcinoid tumor, B. Alveolar carcinoma, C. Hamaoma, D. Asthma
A: Carcinoid tumor
Answer: A: Carcinoid tumor 
Explanation: Ans. is 'a' i.e., Carcinoid tumor o The normal lung contains neuroendocrine cells within the epithelium as single cells or as clusters, the neuroepithelial bodies. o Neuroendocrine lesions of lung may be of following types ? Non-Neoplastic (i) Reactive neuroendocrine cell hyperplasia in response to inflammation or scarring. (it) Idiopathic pulmonary neuroendcrine cell hyperplasia -p a pressursor lesion of tumorlets and carcinoids. Neoplastic (a) Benign (i) Tumorlets --> Small, inconsequential hyperplastic neuroendocrine cells seen in areas of scarring or chronic inflammation. (b) Malignant (i) Carcinoid tumor (ii) Small cell carcinoma of lung (iii) Large cell neuroendocrine carcinoma of the lung.