Answer the following question given this paragraph: 

The largest known virus, called mimivirus, is so large that scientists first mistook it for a bacterium. It was first discovered in amoeba, in 1992, and was identified as a virus in 2003. Scientists believe that mimivirus may cause certain types of pneumonia in humans. The core contains DNA, with the majority of the DNA in genes, and only 10% DNA of unknown function ("junk" DNA).


Q: What is the largest known virus?

 Choices:

- polyomavirus

- influenza virus

- pneumonia virus

- mimivirus

A:
mimivirus
