The correct option is C Bipolar neurons Bipolar neurons have a single dendrite and a single axon. They are seen in specialized sensory organs like olfactory nerves, retina and cochlea. Unipolar neurons have a single protoplasmic process extending from the cyton or cell body. They are usually found in insects. Multipolar neurons are found in the brain and the spinal cord. Neurochemically specialised neurons are found in the nervous system of the gut.