Task: Text Categorization
Input (English): Question: After antigenic recognition, the T cell receptor transmits an activation signal through: 
 Options:  <0> CD3 and chain . <1> Ig and Ig. <2> TAP1 and TAP2. <3> RAG1 and RAG2. <4> Determining regions of complementarity 1 and 2.
Output (English): biology