This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: ECG and Arrhythmia 3, Subject name: Medicine
[{'content': 'Most common sustained tachycardia in healthy young women is? \nSelect and explain. \nA. AVN, B. AV, C. Atrial fibrillation, D. Pre-excitation syndrome', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Most common sustained tachycardia in healthy young women is: AVN/PSVT Option B: AV (Atrioventricular Reentrant Tachycardia) seen with pre excitation syndrome like WPW syndrome where there is abnormal conduction pathway in the hea.', 'role': 'assistant'}]