Task: Text Categorization
Input (English): Question: Of the following surface markers, one of them is expressed only in the virgin T lymphocytes, while the rest are also found in the population of activated T lymphocytes. Which? 
 Options:  <0> The adhesion molecule L-selectin. <1> The T lymphocyte receptor (TCR). <2> The integrin LFA-1. <3> The CD4 co-receptor molecule. <4> The integrin VLA-4.
Output (English): pharmacology