You will be given a definition of a task first, then some input of the task.
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: In the presence of a patient with Crohn's disease who is going to start treatment with biological anti-TNF therapy (antibodies against tumor necrosis factor alpha), which of the following diagnostic tests is not necessary before initiating such therapy?
Options: <0> Evaluation of the immune stage by lymphocyte count. <1> Serology of hepatitis B virus (HBV). <2> Tuberculin test. <3> Chest x-ray. <4> Serology of the human immunodeficiency virus (HIV).
Output:
medicine