This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Physiology
[{'content': 'Phospholipid associated with mechanism of hormone action is \nSelect and explain. \nA. Phosphatidyl choline, B. Phosphatidyl lecithin, C. Plasmalogen, D. Phosphatidyl inositol', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Phosphatidylinositol Is a Precursor of Second Messengers The inositol is present in phosphatidylinositol as the stereoisomer, myoinositol. Phosphatidylinositol 4,5 bisphosphate is an impoant constituent of cell membrane phospholipids? upon stimulation by a suitable hormone agonist, it is cleaved into diacylglycerol and inositol trisphosphate, both of which act as internal signals or second messengers.', 'role': 'assistant'}]