Task: Question Answering
Input (English): Question: The ribonucleotide reductase: 
 Options:  <1> Involved in the synthesis of deoxyribonucleotides. <2> It uses NADPH as a coenzyme. <3> It is an enzymatic system. <4> Acts in collaboration with the thioredoxin. <5> All the above is true.
Output (English): 5