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
Appreciation of shape and size of an object placed in the hand is lost in the lesion of: 
Select and explain. 
A. Tractus gracilis, B. Tractus cuneatus, C. Lateral spinothalamic tract, D. Spino-reticular tract
B: Tractus cuneatus
Answer: B: Tractus cuneatus 
Explanation: B i.e. Tractus cuneatus