Task: Text Categorization
Input (English): Question: Of the following pairs of surface molecules, what is used by the virgin T lymphocytes to extravasate to the lymph node? 
 Options:  <0> CCR7 and L-selectin. <1> VCAM and L-selectin. <2> CCR7 and ICAM-1. <3> CCR9 and L-selectin. <4> CCR4 and VCAM-1.
Output (English): pharmacology