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: Biochemistry
[{'content': 'True about G protein coupled receptors is? \nSelect and explain. \nA. G proteins bind to hormones on the cell surface, B. All the three subunits alpha, beta and gamma should bind each other for G protein to act, C. G proteins act as inhibitory and excitatory because of difference in alpha subunit, D. G protein is bound to GTP in resting state', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]