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
[{'content': 'Secondary messengers include: \nSelect and explain. \nA. cAMP, B. IP3, C. Diacylglycerol, D. All', 'role': 'user'}, {'content': 'Answer: D \nExplanation: A i.e. c-AMP; B i.e. IP3; C i.e. Diacylglycerol', 'role': 'assistant'}]