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
Stereoanesthesia is due to lesion of 
Select and explain. 
A. Nucleus Gracilis, B. Nucleus cuneatus, C. Cerebral cortex, D. Spinothalamic tract
C: Cerebral cortex
Answer: C: Cerebral cortex 
Explanation: (C) Cerebral cortex # Stereognosis:> The ability to identify objects by handling them with out looking at them is called stereognosis.> Ability obviously depends upon relatively intact touch & pressure sensation & is compromised when the dorsal columns are dam- aged.> It also has a large cortical component; impaired cortex & sometimes occurs in the absence of any detectable defect in touch & pressure sensation when there is a lesion in the parietal lobe posterior to the postcentral gyrus.