This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Medicine
[{'content': 'Which one of the following excludes history of transient ischaemic attack? \nSelect and explain. \nA. Haemorrhage, B. Embolic episodes, C. Thrombotic episodes, D. Complete stroke', 'role': 'user'}, {'content': 'Answer: A \nExplanation: (A) Haemorrhage > An important cause of transient cerebral ischemia is embolization.> In many patients with these attacks, a source is readily apparent in the heart or a major extracranial artery to the head & emboli sometimes are visible in retinal arteries> Moreover, an embolic phenomenon explains why separate attacks may affect different parts of the territory supplied by the same major vessel.> Cardiac causes of embolic ischemic attacks include rheumatic heart disease, mitral valve disease, cardiac arrhythmia, infective endocarditis, atrial myxoma, and mural thrombi complicating myocardial infarction.> Atrial septal defects and patent foramen ovale may permit emboli from the veins to reach the brain ("paradoxical emboli").> An ulcerated plaque on a major artery to the brain may serve as a source of emboli.> Patients with AIDS have an increased risk of developing transient ischemic deficits or strokes.', 'role': 'assistant'}]