This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.N.S, Subject name: Medicine
[{'content': 'A patient has preserved light touch and absent pain and temperature over the left upeer limb. This pattern of sensory loss is called- \nSelect and explain. \nA. Stock and glove type, B. Segmetal type, C. Dissociated type, D. Mononeuritis type', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Vishram singh textbook of clinical neuroanatomy 2nd edition. * In dissociated sensory loss,the lesion involves decussating lateral spinothalamic fibers in the anterior commissure so that there is bilateral loss of pain and temperature sensations but other sensations are preserved in uncrossed tracts of posterior column.', 'role': 'assistant'}]