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
Surfactant is secreted by: 
Select and explain. 
A. Pnemocyte I, B. Pnemocyte II, C. Goblet cells, D. Pulmonary vessels
B: Pnemocyte II
Answer: B: Pnemocyte II 
Explanation: None