This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nervous System, Subject name: Physiology
[{'content': 'Appreciation of shape and size of an object placed in the hand is lost in the lesion of \nSelect and explain. \nA. Tractus gracilis, B. Tractus cuneatus, C. Lateral spinathalamic tract, D. Spino - reticular tract', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. (b) Tractus cuneatus(Ref: Ganong, 25th ed/p.168)Appreciation of shape and size of an object placed in the hand is a function of Tractus cuneatus', 'role': 'assistant'}]