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: Physiology
[{'content': 'Surfactants are produced by: \nSelect and explain. \nA. Type 1 pneomocytes, B. Type 2 pneumocytes, C. Smooth muscle, D. Macrophages in alveoli', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Surfactants are produced by type 2 epithelial cells(pneumocytes) of the alveoli Ref: Guyton and Hall textbook of medical physiology 12th edition, page number 320,321', 'role': 'assistant'}]