This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Pharmacology
Anti-arrhythmic drug+ antianginal drugs 
Select and explain. 
A. Beta blockers, B. Nitrates, C. Rho kinase inhibitor, D. Potassium channel openers
A: Beta blockers
Answer: A: Beta blockers 
Explanation: Beta blockers are class 2 anti arrhythmic agents which are also used in angina except in variant angina. Ref katzung 12th ed.