This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Anatomy
[{'content': 'Most common cause of left sided hea failure is \nSelect and explain. \nA. Myocardial infarction, B. Systemic hypeension, C. Rheumatic hea disease, D. Infective endocarditis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Refer robbins 9/e 529 Myocardial infarction (MI), also known as a hea attack, occurs when blood flowdecreases or stops to a pa of the hea, causing damage to the hea muscle. The most common symptom is chest pain or discomfo which may travel into the shoulder, arm, back, neck or jaw. Often it occurs in the center or left side of the chest and lasts for more than a few minutes.The discomfo may occasionally feel like heaburn. Other symptoms may include shoness of breath, nausea, feeling faint, a cold sweat or feeling tired. About 30% of people have atypical symptoms. Women more often present without chest pain and instead have neck pain, arm pain or feel tired. Among those over 75 years old, about 5% have had an MI with little or no history of symptoms. An MI may cause hea failure, an irregular heabeat, cardiogenic shock or cardiac arrest', 'role': 'assistant'}]