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
Preganglionic parasympathetic nerve fiber which supply pelvic viscera is/are -a) Ventral rami of S2S3S4 b) Hypogastric plexusc) Pudendal nerved) Pelvic Splanchnic nervee) Inferior mesenteric plexus 
Select and explain. 
A. b, B. ad, C. ac, D. ab
B: ad
Answer: B: ad 
Explanation: Ventral rami of S2-4 gives rise to the pelvic splanchnic nerve. They act as preganglionic parasympathetic fibers to pelvic organs.