This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Muscles of Lower Limb, Subject name: Anatomy
[{'content': 'Name the Marked Structure -5 \nSelect and explain. \nA. Gracilis, B. Vastus lateralis, C. Rectus femoris, D. Vastus medialis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Gracilis', 'role': 'assistant'}]