This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Abdomen & Pelvis, Subject name: Anatomy
[{'content': 'Dermatome of UMBILICUS is: \nSelect and explain. \nA. T10, B. L2, C. L3, D. L4', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (A). T10 A dermatome is an area of skin that is mainly supplied by afferent nerve fibers from a single nerve which forms a part of a spinal nerve. There are 8 cervical nerves (C1 being an exception with no dermatome), 12 thoracic nerves, 5 lumbar nerves and 5 sacral nerves. Each of these nerves relays sensation (including pain) from a particular region of skin to the brain. Along the thorax and abdomen the dermatomes are like a stack of discs forming a human, each supplied by a different spinal nerve.', 'role': 'assistant'}]