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
All of the following are true about grey communicans except: 
Select and explain. 
A. U nmyel inated, B. Connects to spinal nerves, C. Pregang I ion ic, D. Present medial to the white ramus cornmunicans
C: Pregang I ion ic
Answer: C: Pregang I ion ic 
Explanation: Ans. c. PreganglionicEach spinal nerve receives a branch called a gray ramus communicans from the adjacent paraveebral ganglion of the sympathetic trunk. The gray rami communicans contain postganglionic nerve fibers of the sympathetic nervous system and are composed of largely unmyelinated neurons. This is in contrast to the white rami communicans, in which heavily myelinated neurons give the rami their white appearance. "The gray ramus communicans connects the sympathetic trunk or a ganglion to the anterior ramus and contains the postganglionic sympathetic fibers. It appears gray because postganglionic fibers are nonmyelinated. The gray ramus communicans is positioned medial to the white ramus communicans."