This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Development of GU system and Neuro-vascular supply of pelvis & perineum, Subject name: Anatomy
Which of the following structure doesn't pierce sacrotuberous ligament 
Select and explain. 
A. Inferior gluteal aery, B. Perforating cutaneous nerve, C. Posterior femoral cutaneous nerve, D. Coccygeal plexus
C: Posterior femoral cutaneous nerve
Answer: C: Posterior femoral cutaneous nerve 
Explanation: Sacro - tuberous ligament. Structures piercing sacro-tuberous ligament are coccygeal branches of inferior gluteal aery perforating cutaneous nerve filaments of coccygeal plexus.