This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metabolism of carbohydrate, Subject name: Biochemistry
[{'content': 'Second messengers, DAG and IP3 are formed from \nSelect and explain. \nA. Phosphatidyl choline, B. Phosphatidyl ethanolamine, C. Phosphatidyl serine, D. Phosphatidyl inositol', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Phosphatidylinositol Is a Precursor of Second MessengersThe G proteins activate phospholipase C, which hydrolyzes phosphatidylinositol4,5-bisphosphate to produce diacylglycerols and the water-soluble second messenger inositol 1,4,5-triphosphate (IP3).Ref: Harper&;s Biochemistry; 30th edition; Chapter 54; White Blood Cells', 'role': 'assistant'}]