Task: Text Categorization
Input (English): Question: The forces that stabilize the alpha helix are: 
 Options:  <0> Intra-chain hydrogen bridges parallel to the axis of the helix. <1> Disulfide bridges between methionines. <2> Hydrogen bridges between chains perpendicular to the axis of the helix. <3> Van der Waals forces among the radicals. <4> Links between lysine radicals.
Output (English): biology