In a neuron, conversion of electrical signal to a chemical signal occurs at / in :- A cell body B axon end C dendrite end D axon

The conversion of an electrical signal to a chemical signal in a neuron occurs at the axon end. So, the correct answer is B. Axon end.

Here's a step-by-step explanation:

1. The process begins with an electrical signal, or action potential, traveling down the axon of the neuron.

2. When this electrical signal reaches the end of the axon (axon terminal), it triggers the release of neurotransmitters, which are chemical signals.

3. These neurotransmitters are stored in vesicles at the axon terminal. The electrical signal causes these vesicles to fuse with the cell membrane, releasing the neurotransmitters into the synaptic cleft.

4. The neurotransmitters then bind to receptors on the next neuron, converting the chemical signal back into an electrical one, and the process begins again.

So, the conversion of electrical signal to chemical signal occurs at the axon end.