This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anatomy
Structure crossing dorsal surface of ischial spine are A/E : 
Select and explain. 
A. Internal pudendal vessel, B. Pudendal nerve, C. Obturator nerve, D. Nerve to obturator internus
C: Obturator nerve
Answer: C: Obturator nerve 
Explanation: C. i.e. Obturator nervePsoas major, iliacus & pectineus muscles, femoral vessels and nerve, femoral branch of genitofemoral nerve, lateral cutaneous nerve of thigh and lymphatics pass below inguinal ligament.'PIN' structures i.e. Pudendal nerve, Internal Pudendal vessels, Nerve to obturator internus come out of greater sciatic foramen, cross the dorsal surface of ischial spine & enter into lesser sciatic foramen.