<prompt> Major surfactant is ?Dipalmitoyl lecithineDipalmitoyl cephalineDipalmitoyl serineDipalmitoyl inositol  <response>: 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. 