This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
[{'content': 'All the findings in wolf Parkinson white syndrome except \nSelect and explain. \nA. Narrow QRS complexes, B. Normal QT interval, C. Slurred and tall QRS, D. Sho PR interval', 'role': 'user'}, {'content': 'Answer: A \nExplanation: ECG shows a sho P-R interval (<0.12 s), slurred initial poion of the QRS (delta wave), and prolonged QRS duration produced by slow conduction through direct activation of ventricular myocardium over the AP Ref Harrison 20th edition pg 1435', 'role': 'assistant'}]