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: Physiology
[{'content': 'About type-II pneumocytes, which is not true: \nSelect and explain. \nA. Do not secrete surfactant, B. Mesodermal, C. Form blood air barrier, D. Appear at 5th month of intrauterine life', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Do not secrete surfactant', 'role': 'assistant'}]