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': 'Two point threshold test, tests the integrity of: \nSelect and explain. \nA. Anterior spinothalamic tract, B. Lateral coicospinal tract, C. Lateral spinothalamic tract, D. Dorsal column', 'role': 'user'}, {'content': "Answer: D \nExplanation: Dorsal column (medial lemniscal system): Fibres mediating fine touch, fine pressure, two point discrimination, proprioception, joint position sense and vibration ascends in the dorsal column. Ref: Ganong's Review of medical physiology, 22 Edition, Page 138.", 'role': 'assistant'}]