This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nerve supply of Lower Limb, Subject name: Anatomy
[{'content': 'Posterior thigh dermatome is: \nSelect and explain. \nA. L-4, B. L-5, C. S-1, D. S-2', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Posterior calf and thigh region has S2 dermatome.', 'role': 'assistant'}]