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: Medicine
[{'content': 'Pulsus Bigeminus is seen in therapy with: \nSelect and explain. \nA. Digitalis, B. Beta Blockers, C. ACE Inhibitors, D. Calcium Channel Blockers', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Answer is A (Digitalis) Pulsus Bigeminus is recognized as a cause of digitalis toxicity. Pulsus Bigeminus is a disorder of rhythm (Irregular rhythm; arrhythmia) most commonly caused by Premature Ventricular Contractions that results in a pulse with irregular rhythm that alternates in amplitude (pressure) from beat to beat. The most common cause of Pulsus Bigeminus is Digitalis and Pulsus Bigeminus is recognized as a cause of digitalis toxicity.', 'role': 'assistant'}]