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
The following ECG shows: 
Select and explain. 
A. Ventricular bigemini, B. P. pulmonale, C. Electrical alternans, D. Wrong calibration
A: Ventricular bigemini
Answer: A: Ventricular bigemini 
Explanation: ANS. AThis was not the exact ECG asked. But the options were the same.P. pulmonaleCriteria: (A) >2.5 mm in inferior leads (2, 3, AVF)(B) >1.5 mm in VI and V2Electrical alternans1. Consecutive normally conducted QRS complexes in height2. Seen in pericardial effusion.