This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Other topics and Adverse effects, Subject name: Anatomy
[{'content': 'After staing your patient on imipramine, his hea rate rises to 120/min and he has blurred vision. These effects can be explained by the fact imipramine: \nSelect and explain. \nA. Is a muscarinic antagonist, B. Potentiates epinephrine, C. Is a ganglionic blocker, D. Is a potent a-adrenergic blocker', 'role': 'user'}, {'content': 'Answer: A \nExplanation: (Ref: KDT 6/e p444) These symptoms are of anticholinergic drugs. Tricyclic antidepressants have powerful anticholinergic propeies and can lead to these symptoms.', 'role': 'assistant'}]