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
Posterior thigh dermatome is: 
Select and explain. 
A. L-4, B. L-5, C. S-1, D. S-2
D: S-2
Answer: D: S-2 
Explanation: Posterior calf and thigh region has S2 dermatome.