This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S, Subject name: Medicine
Pulsus bigeminy is seen in? 
Select and explain. 
A. Digitalis, B. Beta Blockers, C. ACE inhibitors, D. Calcium channel blockers
A: Digitalis
Answer: A: Digitalis 
Explanation: digoxin and digitalis causes pulses bigemini Pulsus bigeminus is a cardiovascular phenomenon characterized by groups of two heabeats close together followed by a longer pause. The second pulse is weaker than the first. Look for a pattern of what appears to be a relatively normal QRS complexes, each followed by a smaller, abnormal one . Ref Davidson 23rd edition pg 456