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.

Q: 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.

A: biology
****
Q: Question: The hepatic synthesis of methionine from homocysteine ​​requires: 
 Options:  <0> N5, N10 methenyl-tetrahydrofolate. <1> N10-formyl-tetrahydrofolate. <2> N5-formimino-tetrahydrofolate. <3> N5-methyl-tetrahydrofolate. <4> N5, N10 methylene-tetrahydrofolate.

A: chemistry
****
Q: Question: The characteristic Rovsing sign in acute appendicitis consists of: 
 Options:  <0> Pain in the epigastric pressure when applying a firm and persistent pressure on McBurney's point. <1> Acute pain that appears when the appendix is ​​compressed between the abdominal wall and the iliac crest. <2> Passive rebound sensitivity in the abdominal wall. <3> Loss of abdominal sensation when contracting the muscles of the abdominal wall. <4> Pain at McBurney's point when compressing the lower left quadrant of the abdomen.

A:
medicine
****