This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Other topics and Adverse effects, Subject name: Anatomy
[{'content': 'Fastest acting receptor/transduction mechanism is \nSelect and explain. \nA. Adenylyl cyclase-cyclic AMP pathway, B. Phospholipase C-IP3:DAG pathway, C. Intrinsic ion channel operation, D. Nuclear receptor', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ref-KDT 6/e p40 Drugs acting and ionotropic receptor are fast acting where as those acting through nuclear receptors are slowest in action', 'role': 'assistant'}]