This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Biochemistry
[{'content': 'Which of the following would increase the levels of acetylcholine in the synaptic cleft? \nSelect and explain. \nA. Administration of glucose, B. Activation of muscarinic receptors, C. Activation of nicotinic receptors, D. Inhibition of acetylcholinesterase', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Of the above only the inhibition of acetylcholinesterase, the enzyme that breaks down acetylcholine into acetate and choline and effectively stops cholinergic signaling between two cells, would increase levels of acetylcholine in the synaptic cleft.', 'role': 'assistant'}]