Answer:
Dopamine
Step-by-step explanation:
The role of dopamine in Parkinson's disease is very important. It is the neurotransmitter that plays a crucial role in a disease called Parkinson. It is the main agent that causes Parkinson's disease. Dopamine is related to our initiation in movement. The patient who suffered from Parkinson's disease has lost dopamine in substance nigra in the brain. The patient lost his coordination between the brain and the muscle movement.
Thus here Mr. Anderson was suffering from Parkinson's disease that causes due to the loss of dopamine.