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: Pharmacology
[{'content': 'Atropine can cause: \nSelect and explain. \nA. Decreased cardiac output, B. Heart block, C. Hypertension, D. Mydriasis', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Atropine is an anticholinergic drug. It causes increased heart rate.\nAtropine causes mydriasis and decreased sweating.\nNo consistent or marked effect on BP, though hypotension may occur due to histamine-release and direct vasodilator action (at high dose); tachycardia and vasomotor centre stimulation tend to rise BP.', 'role': 'assistant'}]