Task: Question Answering
Input (English): Question: In eukaryotes, the DNA polymerase β: 
 Options:  <1> It is a polymerase of family B. <2> It carries out the synthesis and repair of mitochondrial DNA. <3> Replicate DNA with injuries. <4> It is involved in the repair of nuclear DNA. <5> The synthesis of nuclear DNA begins.
Output (English): 4