Guest OS setting for OME on ESXi?

Hi All,

Bit of a newbie question here. I've installed OME 3.8 on ESXi 6.5 and it's throwing up a suggestion about selecting a guest OS for OME. I've searched for this a while and come up empty. Any thoughts or suggestions?

The exact message is: The guest OS for this virtual machine is currently set to 'Other'. You should specify the correct guest OS to allow for guest-specific optimizations and to enable installation of VMware Tools.