This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Physiology
Which class of neurotransmitter would be most affected by a toxin that disrupted microtubules within neurons? 
Select and explain. 
A. Amino acid transmitters, B. Catecholamine transmitters, C. Membrane-soluble transmitters, D. Peptide transmitters
D: Peptide transmitters
Answer: D: Peptide transmitters 
Explanation: .