Task: Text Categorization
Input (English): Question: The antiviral tamiflu that is used against the bird flu virus acts: 
 Options:  <0> Inhibiting viral neuraminidase. <1> Inactivating the viral protease responsible for the processing of capsomere precursors. <2> Preventing the decapsidation of viral particles. <3> Blocking the interaction of viral particles with their cellular receptor. <4> Altering the activity of the viral DNA polymerase.
Output (English): biology