This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: ECG and Arrhythmias 1, Subject name: Medicine
This ECG is of a 23 year old medical student who complained of an irregular heabeat. Other than an irregular pulse, his hea was clinically normal. What does the ECG show? 
Select and explain. 
A. Venticular Extra-systole, B. Complete hea block, C. Sinus Tachycardia, D. PSVT
A: Venticular Extra-systole
Answer: A: Venticular Extra-systole 
Explanation: The ECG shows a hea rate of 100/min with normal axis. P wave and PR interval are in normal limits. Wide complex qRS is noted in lead II, III indicating Ventricular extra-systoles or premature ventricular contractions. ST segment and QT interval are within normal limits. In young and asymptomatic individuals extra-systoles do not indicate any significant hea disease.