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: The non-selective medium commonly used for the growth of gonococcus (Neisseria gonorrhoeae) is: 
 Options:  <0> Chocolate agar. <1> Agar blood. <2> Mannitol saline agar. <3> Nutritious agar <4> MacConkey agar.

A: biology
****
Q: Question: Fibrinogen is activated by: 
 Options:  <0> Platelet stopper <1> Plasmina. <2> Thrombin <3> Thromboplastin. <4> Factor von Willebrand.

A: biology
****
Q: Question: Th1 lymphocytes: 
 Options:  <0> They produce interferon gamma (IFN-γ). <1> They mediate allergic diseases. <2> Activate mast cells <3> They are very active against extracellular bacteria. <4> They recruit neutrophils at the sites of antigen recognition.

A:
biology
****