This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Lipids, Subject name: Biochemistry
[{'content': 'Second messenger is produced from: \nSelect and explain. \nA. Phosphatidylinositol, B. Phosphatidylserine, C. Phosphatidylcholine, D. None', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A. Phosphatidylinositol(Ref: Harper 31/e page 202)PhosphatidylinositolPhosphatidylinositol presents in the cell membrane.The inositol is present as its stereoisomer, myoinositol.Plays an important role in cell signaling and membrane trafficking.Phosphatidyl inositol is a precursor of second messenger in hormonal pathways.Action of Phospholipase C on Phosphatidyl Inositol 4,5 Bisphosphate (PiP2 )Diacyl Glycerol and Inositol Tris phosphate IP3 are formed and both act as second messengers.', 'role': 'assistant'}]