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: Physiology
True regarding autonomic system is 
Select and explain. 
A. High centre of integration is medulla oblongata, B. Conduction autonomic fibres is same as in somatic motor fibres, C. Preganglionic parasympathetic fibres are more lengthy, D. Ratio of preganglionic and post ganglionic fibres is 20:1
C: Preganglionic parasympathetic fibres are more lengthy
Answer: C: Preganglionic parasympathetic fibres are more lengthy 
Explanation: Autonomic nervous system
-        The highest centre is the hypothalamus.
-        Conduction speed is slower in ANS compared to somatic nerves. ANS is non-myelinated. 
-        Preganglionic parasympathetic fibers are lengthier because parasympathetic ganglia lie closer to the organs.
-        Ratios of preganglionic to post ganglionic fibers are 1:20 to 1:100 in sympathetic system.