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': 'Carcinoid tumors of lung arises from \nSelect and explain. \nA. Type-II pneumocytes, B. Kulchitsky (K) cells, C. Mucus (goblet) cells, D. Clara cells', 'role': 'user'}, {'content': 'Answer: B \nExplanation: . Kulchitsky (K) cells', 'role': 'assistant'}]