Appreciation of shape and size of an object placed in the hand is lost in the lesion of
**Core Concept**
The question tests the understanding of **stereognosis**, the ability to perceive the form and shape of an object by touch, which is a function of the **somatosensory cortex**. This complex sensory function involves the integration of tactile and proprioceptive information.
**Why the Correct Answer is Right**
Since the correct answer is not provided, let's discuss the general concept. A lesion in the **parietal lobe**, particularly in the **postcentral gyrus**, can lead to impaired stereognosis. This is because the parietal lobe is responsible for processing sensory information from the body, including touch and spatial awareness.
**Why Each Wrong Option is Incorrect**
**Option A:** Without the specific option, it's challenging to provide a detailed explanation. However, any option that does not involve the somatosensory pathway or the parietal lobe is likely incorrect.
**Option B:** Similarly, without the specific option, it's difficult to explain why it's incorrect. Generally, options that involve other sensory pathways or brain regions not associated with touch and spatial awareness would be incorrect.
**Option C:** and **Option D:** would follow similar reasoning, with incorrect options being those that do not relate to the somatosensory cortex or the parietal lobe.
**Clinical Pearl / High-Yield Fact**
A key point to remember is that **asterognosis** (inability to identify an object by touch) and **agraphesthesia** (inability to recognize numbers or letters written on the skin) are related conditions that also result from lesions in the somatosensory pathway.
**Correct Answer:** Not provided, as the question options are missing.