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: Medicine
[{'content': 'patient with atrial fibrillation which is false \nSelect and explain. \nA. Brain imaging is not done, B. p wave is absent, C. anticoagulants added, D. palpitations are present', 'role': 'user'}, {'content': 'Answer: A \nExplanation: ATRIAL FIBRILLATION CLINICAL FEATURES Palpitations, which are sensations of a racing, uncomfoable, irregular heabeat or a flip-flopping in your chest. Weakness. Reduced ability to exercise. Fatigue. Lightheadedness. Dizziness. Shoness of breath. Chest pain. ECG Features of Atrial Fibrillation Irregularly irregular rhythm. No P waves. Absence of an isoelectric baseline. Variable ventricular rate. QRS complexes usually < 120 ms unless pre-existing bundle branch block, accessory pathway, or rate related aberrant conduction ref : harrisons 21st ed', 'role': 'assistant'}]