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': 'Which of the following drugs act through heptahelical receptors \nSelect and explain. \nA. Insulin, B. Estrogen, C. Local anaesthesia, D. Salbutamol', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ref-KDT 6/e p45 GPCRs are heptahelical or serpentine receptor.salbutamol acts thrithr beta2 receptor which are GPCRs', 'role': 'assistant'}]