This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': 'Action of subunit by G-protein is \nSelect and explain. \nA. Binding of agonist, B. Conversion of GDP to GTP, C. Breaking of GTP to GDP, D. Internalization of receptor', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Alpha subunit G protein contains GTPase activity and thus dissociates GTP to form GDP.thus re-uniting alpha subunit with beta and gamma submit Ref-KDT 7/e p46', 'role': 'assistant'}]