This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Abdomen & Pelvis, Subject name: Anatomy
A 34-year-old man is admitted to the emergency department after a traumatic landing into a swimming pool from a high diving platform. The patient has multiple traumas in his abdominal cavity. After a reconstructive operation of his abdominal organs the patient develops a high fever. Radiographic examination reveals that the lower portion of the descending colon and rectum has become septic and must be excised. Six months postoperatively the patient complains of impotence. Which of the following structures was most likely injured during the second operation? 
Select and explain. 
A. Pudendal nerve, B. Sacral splanchnic nerves, C. Pelvic splanchnic nerves, D. Sympathetic chain
C: Pelvic splanchnic nerves
Answer: C: Pelvic splanchnic nerves 
Explanation: The pelvic splanchnic nerves contain parasympathetic efferent fibers that mediate erection. These same nerves innervate the hindgut, the portions of the large intestine that were removed in this patient.