Concept: This question tests your knowledge of the different parts of the human brain and their specific functions, particularly focusing on higher cognitive functions.

Why (D) is correct: The figure shows different parts of the human brain. Part I represents the cerebrum, which is the largest part of the brain. The cerebrum is responsible for higher cognitive functions such as intelligence, memory, learning, voluntary actions, and processing sensory information.

Why other options are wrong:

• (A) IV is incorrect: IV points to the cerebellum, which is primarily involved in coordinating voluntary movements, balance, and posture.
• (B) III is incorrect: III points to the brainstem (specifically the pons or medulla oblongata region), which controls vital involuntary functions like breathing, heart rate, and blood pressure.
• (C) II is incorrect: II points to the thalamus, which acts as a relay station for sensory information to the cerebrum and plays a role in consciousness and sleep.

Common Mistake: Students often confuse the functions of the cerebrum and cerebellum, especially regarding coordination versus higher thought processes.

NEET Tip / Mnemonic: Remember that the Cerebrum is for Cognition, Consciousness, and Complex thought (like intelligence and memory). The Cerebellum is for Coordination and Calibration of movement.

Correct Answer: (D)