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: Which of the following statements about focal nodular hyperplasia of the liver is true?
Options: <0> It is considered that its appearance is related to the consumption of contraceptives. <1> The risk of breakage hemoperitoneum is similar to that of the adenoma. <2> There is a risk of tumor degeneration. <3> It behaves as a focal hypovascular lesion in computed tomography with contrast administration. <4> In the histological study of the lesion, in addition to hepatocytes, bile ducts and other liver cells can be observed.
medicine

Question: In a Gram positive pathogen involved in pharyngitis and rheumatic fever:
Options: <0> Staphylococcus aureus. <1> Micrococcus luteus. <2> Moraxella catarrhalis. <3> Haemophilus influenzae. <4> Streptococcus pyogenes.
biology

Question: The first stage of the mechanism of dehydration of cyclohexanol with H2SO4 is:
Options: <0> Loss of OH-. <1> Formation of an ester sulfate. <2> Protonation of alcohol. <3> Loss of H + by alcohol. <4> Elimination of H2O from alcohol.
chemistry