Which of the Following is a Cluster of Neuron Cell

Question

Which of the following is a cluster of neuron cell bodies found in Planaria?  
A) Brain
B) Nerve cord
C) Ganglion
D) Nerve net
E) Cephalization

Accepted Answer

Ganglion is a cluster of neuron cell bodies found in Planaria. Brain is also found in some organisms like vertebrates, but not in Planaria. Nerve cord and nerve net are more spread out structures and not a cluster of cell bodies. Cephalization is the process of concentration of nerve cells and sensory organs at the anterior end of an organism, but it is not a structure itself.