This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Sympathetic System, Subject name: Pharmacology
[{'content': 'A hypeensive patient on medication with beta blocker develops severe bradycardia on taking medicines. Which of the following is least likely to be the responsible agent? \nSelect and explain. \nA. Metoprolol, B. Nadolol, C. Pindolol, D. Atenolol', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Pindolol has intrinsic sympathomimetic acitivity and therefore has lesser risk of causing bradycardia Beta-Blockers with Intrinsic Sympathomimetic Activity (ISA) Preferred in the patients prone to develop severe bradycardia with b blocker therapy. However, these drugs are less useful in angina (because of stimulation of hea by b1 receptors). The drugs can be remembered as * COntain - Celiprolol, Oxprenolol * Paial - Pindolol, Penbutolol * Agonistic - Alprenolol * Activity -Acebutolol', 'role': 'assistant'}]