In this task, you are given a question and answer options for that question. Using this information, you have to classify each text into different topics: medicine, nursery, psychology, chemistry, pharmacology, biology.

Question: A 52-year-old patient who reported dyspnea of ​​medium effort for 6 months. He has not presented angina or syncopes. The physical examination and diagnostic tests show the existence of an average aortic transvalvular gradient of 55 mmHg and a calculated area of ​​0.7 cm2. Ejection fraction of 65%. The treatment that should be indicated to this patient is: 
 Options:  <0> Diuretics and more frequent controls by a specialist. <1> In case of increasing dyspnea on exertion, a percutaneous dilatation of the aortic valve with a balloon catheter should be performed. <2> Replacement of the aortic valve with a prosthesis / bioprosthesis. <3> Replacement of the aortic valve by a homograft. <4> Implantation of a percutaneous valve.
medicine