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: Unknown
[{'content': 'Which body part has maximum representation in CNS? \nSelect and explain. \nA. Urinary Bladder, B. Lower limb, C. Abdomen, D. Thumb', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Somatosensory cortical areas\nPrimary- Post central gyrus\nAssociation area- parietal lobe\nSecondary area- sylvian fissure\n“size of the cortical receiving area for impulses from a particular part of the body is proportional to the use of the part”\nThumb and lips-maximum representation\nVertical columnar arrangement', 'role': 'assistant'}]