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
[{'content': 'True regarding autonomic system is \nSelect and explain. \nA. 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', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Autonomic nervous system\n-\xa0\xa0\xa0\xa0\xa0\xa0\xa0 The highest centre is the hypothalamus.\n-\xa0\xa0\xa0\xa0\xa0\xa0\xa0 Conduction speed is slower in ANS compared to somatic nerves. ANS is non-myelinated. \n-\xa0\xa0\xa0\xa0\xa0\xa0\xa0 Preganglionic parasympathetic fibers are lengthier because parasympathetic ganglia lie closer to the organs.\n-\xa0\xa0\xa0\xa0\xa0\xa0\xa0 Ratios of preganglionic to post ganglionic fibers are 1:20 to 1:100 in sympathetic system.', 'role': 'assistant'}]