UKMLA PLAB AMC USMLE Prometric MCQ

Question Number 0833
Question:
A 69 year old female is in the hospital for digitalis toxicity. Her blood pressure is 150/95 and her heart rate is 50 beats per minute. Her EKG shows QRS complexes that are not preceded by a P wave. These are normal looking QRS complexes, but they are not preceded by a P wave. There are retrograde P waves appearing after the QRS complex. What rhythm is most likely?

a) normal sinus rhythm
b) sinus tachycardia
c) sinus bradycardia
d) sinus arrhythmia
e) junctional rhythm