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
Craniosacral outflow is mediated by which of the following nervous system? 
Select and explain. 
A. Sympathetic postganglionic fibers, B. Sympathetic preganglionic fibers, C. Parasympathetic postganglionic fibers, D. Parasympathetic preganglionic fibers
D: Parasympathetic preganglionic fibers
Answer: D: Parasympathetic preganglionic fibers 
Explanation: Parasympathetic nerve fibers arise from the central nervous system with the S2, S3, and S4 spinal nerves and from the third, seventh, ninth, and tenth cranial nerves. Because of its location, the parasympathetic system is commonly referred to as having "craniosacral outflow", which stands in contrast to the sympathetic nervous system, which is said to have "thoracolumbar outflow". The parasympathetic nerves that arise from the S2, S3, and S4 spinal nerves are commonly referred to as the pelvic splanchnic nerves or the "nervi erigentes".