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: The transmission of hepatitis E virus is via: 
 Options:  <0> Fecal-oral <1> Body secretions. <2> Bloodline <3> Placenta. <4> Aerial
[EX A]: biology

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

[EX Q]: Question: The retrovirus envelope comes from (the): 
 Options:  <0> Plasma membrane. <1> Nuclear membrane. <2> Endoplasmic reticulum. <3> Golgi apparatus. <4> Mitochondria.
[EX A]:
biology