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': 'After an accident, a patient lost the position and vibration sense from his lower half of the body. It is seen in the lesion of: \nSelect and explain. \nA. Anterior column, B. Dorsal column, C. Spinothalamic tract, D. All of the above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Dorsal column tracts are pa of the medial lemniscal system, convey well-localized sensations of fine touch, vibration, two-point discrimination, and proprioception (position sense) from the skin and joints; they ascend, without crossing, in the dorsal white column of the spinal cord to the lower brain stem. Ref: Waxman S.G. (2010). Chapter 5. The Spinal Cord. In S.G. Waxman (Ed), Clinical Neuroanatomy, 26e.', 'role': 'assistant'}]