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': 'Pain receptors are found in \nSelect and explain. \nA. Dorsal horn, B. Ventralhom, C. Substantia nigra, D. None of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Neurons in the spinal dorsal horn process sensory information, which is then transmitted to several brain regions, including those responsible for pain perception. \nThe dorsal horn provides numerous potential targets for the development of novel analgesics and is thought to undergo changes that contribute to the exaggerated pain felt after nerve injury and inflammation.\n\xa0Dorsal horn neurons receive sensory information from primary afferents that innervate the skin and deeper tissues of the body and that respond to specific types of noxious and non-noxious stimuli. \nThese afferents terminate in the dorsal horn with a distribution pattern that is determined by their sensory modality and the region of the body that they innervate. \nThe incoming information is processed by complex circuits involving excitatory and inhibitory interneurons and transmitted to projection neurons for relay to several brain areas.\nIn addition, nociceptive information is conveyed to the ventral horn and contributes to spinally-mediated nocifensive reflexes.', 'role': 'assistant'}]