This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Lower limb, Subject name: Anatomy
Dermatome of posterior thigh : 
Select and explain. 
A. L4, B. L5, C. S1, D. S2
D: S2
Answer: D: S2 
Explanation: Dermatome for posterior calf and thigh is S2. Ref : Gray's Anatomy The Anatomical Basics of Clinical Practice 41 e pg 1324.