This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Microbiology
[{'content': '3-4 months baby with hea rate 250/min, QRS complex less than 0.07 sec and no P wave, Diagnosis will be \nSelect and explain. \nA. SVT, B. Sinus tachycardia, C. PSVT with block, D. VT', 'role': 'user'}, {'content': 'Answer: A \nExplanation: SVTs are the most common symptomatic arrhythmias in all children including neonates.SVTs usually haveRate > 200 beats/minuteNormal or narrow (<0.07 sec, A wide QRS > 0.07 sec ours the diagnosis of ventricular tachycardia).Ventricular complexes on the surface ECG.', 'role': 'assistant'}]