Concept: This question tests your understanding of the organization of the human nervous system, specifically the classification of the peripheral nervous system and the function of afferent nerve fibers.

Why (D) is correct:

The Assertion (A) states that the visceral nervous system is a part of the peripheral nervous system (PNS). This is correct. The PNS is broadly divided into the somatic nervous system and the autonomic nervous system (ANS). The ANS is also known as the visceral nervous system because it controls involuntary functions of internal organs (viscera).

The Reason (R) states that afferent nerve fibers transmit impulses from tissue organs to the Central Nervous System (CNS). This is also correct. Afferent (sensory) neurons carry sensory information from receptors in the body (including internal organs) towards the CNS.

However, the Reason (R) does not explain why the visceral nervous system is part of the PNS. The visceral nervous system's classification within the PNS is based on its anatomical location and functional role (controlling involuntary visceral functions), not solely on the direction of impulse transmission by afferent fibers, although afferent fibers are indeed part of it.

Why other options are wrong:

• (A) is incorrect because both A and R are correct statements.
• (B) is incorrect because both A and R are correct statements.
• (C) is incorrect because while both statements are correct, the reason does not explain the assertion.

Common Mistake: Students often confuse the divisions of the nervous system (CNS vs. PNS, somatic vs. autonomic) and the types of neurons (afferent vs. efferent).

NEET Tip / Mnemonic: Remember 'SAME DAVE' for nerve types: Sensory Afferent, Motor Efferent; Dorsal Afferent, Ventral Efferent. This helps recall the direction of impulse transmission.

Correct Answer: (D)