Teacher: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.
Teacher: Now, understand the problem? Solve this instance: Question: The T lymphocyte receptor (TCR): 
 Options:  <0> Experience change of class. <1> Does not experience affinity maturation. <2> It transmits signals to the T lymphocyte on its own. <3> It has two sites of antigen recognition such as antibodies. <4> Performs effector functions mediated by its constant regions.
Student:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
biology