Task: Question Answering
Input (English): Question: The Baltimore system of virus classification is based on: 
 Options:  <1> The type of genetic material (DNA or RNA) they possess. <2> The morphology of their virions. <3> The replication of the genome and the synthesis process of its mRNA. <4> The symmetry of the capsid. <5> The presence or absence of wrapping.
Output (English): 3