Cell body of neuron is called: 

• Neurons are nerve cells that transmit nerve signals to and from the brain.
•  The neuron consists of a cell body (or soma) with branching dendrites (signal receivers) and a projection called an axon, which conduct the nerve signal.
• The cell body of neurons is also called as neurocyton or perikaryon, containing the nucleus. Hence, Cell body of the neuron is called perikaryon.

Hence, the correct answer is option D.