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': 'Actin is made of: \nSelect and explain. \nA. Polymerization of G actin, B. Myosin, C. F actine, D. All', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Actin is made of polymerization of monomeric G proteins', 'role': 'assistant'}]