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
[{'content': 'Which of the following parameters is not used for risk assessment and need to sta anticoagulation in a patient of atrial fibrillation? \nSelect and explain. \nA. Age, B. Hea rate, C. Gender, D. Vascular disease', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Hea rate is not used to decide for need for anticoagulation in case of Atrial fibrillation. Components of CHADS2-VASc score are: C Congestive hea failure 1 point H Hypeension 1 point A2 Age > 75 years 2 points D Diabetes 1 point S2 Stroke history 2 points V Vascular disease 1 point A Age > 65 years 1 point Sc Sex, category, female 1 point', 'role': 'assistant'}]