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
Major surfactant is ? 
Select and explain. 
A. Dipalmitoyl lecithine, B. Dipalmitoyl cephaline, C. Dipalmitoyl serine, D. Dipalmitoyl inositol
B: Dipalmitoyl cephaline
Answer: B: Dipalmitoyl cephaline 
Explanation: Ans. is 'b' i.e., Decrease the surface tension of the fluid lining the alveoliDipalmitoyl-phosphatidylcholine (dipalmitoyl-lecithin) is the main surface tension lowering phospholipid in surfactant.