This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nervous system, Subject name: Physiology
[{'content': 'Not a direct effect of Ach \nSelect and explain. \nA. Decrease BP, B. Increase contraction of hea, C. Decrease hea rate, D. Decrease conduction', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Contractility increase is not a direct effect of Ach.Reference: Ganong review of medical physiology 23rd edition Page no: 263', 'role': 'assistant'}]