n 1971, David Baltimore described a scheme for classifying viruses based on how the virus produces mRNA.
The table below shows the results of testing five viruses for nuclease specificity, the ability of the virus to act as an mRNA, and presence (+) or absence (-) of its own viral polymerase.
Virus Nuclease A ( Sensitivity Dnase) (Genome as mRNA -) (Polymerase -)
Virus Nuclease B (Sensitivity Rnase) (Genome as mRNA +) (Polymerase -)
Virus Nuclease C (Sensitivity Dnase) (Genome as mRNA -) (Polymerase +)
Virus Nuclease D (Sensitivity Rnase) (Genome as mRNA -) (Polymerase +)
Virus Nuclease E (Sensitivity Rnase) (Genome as mRNA +) (Polymerase -)
Based on the above table, which virus meets the Baltimore requirements for a retrovirus?