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.

[EX Q]: Question: For the analysis of traces of inorganic constituents, in samples of organic nature, a preliminary treatment of the sample is needed, which normally consists of: 
 Options:  <0> Dissolve the sample in cold water. <1> Dissolve the sample in hot water. <2> Dissolve the sample between 30 and 70 ºC. <3> Heat the sample between 400 and 700 ºC. <4> Heat the sample in 0.1 M hydrochloric acid.
[EX A]: chemistry

[EX Q]: Question: For the care of the nipple cracks during lactation it is recommended: 
 Options:  <0> Washed with water and neutral pH soap after each feeding. <1> Spread a few drops of milk and let air dry after the tetada. <2> The use of healing ointments. <3> 70º alcohol applied through sterile gauze between shots. <4> Apply cold between shots.
[EX A]: nursery

[EX Q]: 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.
[EX A]:
medicine