Task: Question Answering
Input (English): Question: The denaturing of DNA: 
 Options:  <1> It increases when the temperature decreases. <2> It is accompanied by an increase in the absorption of UV light. <3> DNA with high G / C content does so at a lower temperature than those rich in A / T. <4> It is irreversible. <5> Indicates the hydrolysis of phosphodiester bonds.
Output (English): 2