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
Pulmonary surfactant 
Select and explain. 
A. Pulmonary surfactant, B. In Hyaline membrane disease deficiency occurs, C. Theraputic application seen, D. All
D: All
Answer: D: All 
Explanation: A i.e. Secreted from 26th week of gestation; B i.e. In hyaline membrane disease deficiency of surfacetant is seen C i.e. Theraputic application is seen