This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gluteal Region, Subject name: Anatomy
Muscle passing through lesser sciatic foramen is? 
Select and explain. 
A. Obturator externus, B. Obturator intemus, C. Pectinus, D. Piriformis
B: Obturator intemus
Answer: B: Obturator intemus 
Explanation: ANSWER: (B) Obturator internusREF: Grays anatomy 40th ed chapter 40See table of "STRUCTURES PASSING THROUGH GREATER AND LESSER SCIATIC FORAMINA" in Anatomy 2013 Session 2