This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S, Subject name: Medicine
True regarding atrial fibrillation - 
Select and explain. 
A. | Thromboembolism, B. adrenaline treatment, C. Anticoagulant not required, D. Aspirin given
A: | Thromboembolism
Answer: A: | Thromboembolism 
Explanation: thromboembolism is a feature of atrial fibrilation anticoagulant is given but aspirin is not used adrenaline is contraindicated Ref Harrison 20th edition pg 1443