Which of the following is not a neurotransmitter ?

.The chemicals releasing from a pre-synthetic neuron and interacting with specific receptors on post-synaptic neuron are called neurotransmitters. Cortisone is not a neurotransmitter

The adrenal gland produces adrenaline hormone after receiving a message from the brain under a stressful situation. Adrenaline stimulates glycogenolysis in the liver of human beings.

.Heroin is a white or brown powder or a black, sticky goo. It's an opioid drug made from morphine