Task: Text Categorization
Input (English): Question: The increase in standard free energy of ATP hydrolysis depends, among others, on the following structural characteristic: 
 Options:  <0> Its polar character. <1> Its amphipathic nature <2> Its stabilization by resonance. <3> Of the phosphoryl group number it contains. <4> Of the cation with which the soluble salt forms.
Output (English): chemistry