Concept: This question tests your understanding of the location of neuron cell bodies (cytons) for sensory neurons in both the central and autonomic nervous systems.

Why (B) is correct: The cytons (cell bodies) of both central and autonomic sensory fibres are located in the dorsal root ganglia, which are associated with the dorsal part of the spinal cord. These ganglia contain the cell bodies of unipolar sensory neurons that transmit sensory information to the CNS.

Why other options are wrong:

• (A) spinal ganglia: While dorsal root ganglia are a type of spinal ganglia, this option is too general and doesn't specify the correct part of the spinal cord.
• (C) ventral part of spinal cord: The ventral part of the spinal cord primarily contains motor neuron cell bodies and interneurons.
• (D) autonomic ganglia: Autonomic ganglia contain the cell bodies of postganglionic autonomic motor neurons, not sensory neurons.

Common Mistake: Students often confuse the location of sensory neuron cell bodies with motor neuron cell bodies or interneurons within the spinal cord.

NEET Tip: Remember that sensory information enters the spinal cord dorsally (via dorsal roots), and motor commands exit ventrally (via ventral roots). The cell bodies for sensory neurons are in the dorsal root ganglia.

Correct Answer: (B)