Which of the following destroys the acetylcholinesterase?
1.  Malathion
2.  CO
3.  KCN
4.  Colchicine

Parkinson's disease (characterized by tremors and progressive rigidity of limbs) is caused by degeneration of brain neurons that are involved in movement control and make use of neurotransmitter:

1. Norepinephrine

2. Acetylcholine

3. GABA

4. Dopamine