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 simultaneous expression of IgM and IgD is observed for the first time in lymphocytes: 
 Options:  <0> Early Pro-B. <1> B mature. <2> Late Pro-B. <3> Pre-B. <4> B immature
[A]: biology


[Q]: Question: Indicate which of the following is a mitochondrial disease: 
 Options:  <0> α-thalassemia <1> Essential fructosuria. <2> Leigh syndrome. <3> Cushing's syndrome. <4> Sickle cell anemia
[A]: pharmacology


[Q]: Question: The method of choice for the sterilization of products stable to heat but sensitive to moisture is: 
 Options:  <0> Sterilization by dry heat. <1> Filtration. <2> UV radiation. <3> Autoclaved. <4> Sterilization by humid heat.
[A]:
pharmacology