This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bacteriology, Subject name: Microbiology
Botulinum toxin acts on 
Select and explain. 
A. Parasympathetic system, B. Sympathetic system, C. Brain, D. Sensory nerves
A: Parasympathetic system
Answer: A: Parasympathetic system 
Explanation: It acts by blocking the production and release of acetylcholine at synapses and NMJ. Thus affects the parasympathetic system. Reference: Textbook of Microbiology; Anathanarayan and paniker's; 10th edition; Page no: 269