What is Current Mono Runtime Version (Unity 3.5)

I’m unable to get Mono Develop to detect Mono Runtime after installing Unity 3.5. The only option I have is Microsoft .NET (Default). I’ve always had the option to choose previously, and suspect it could have something to do with recently uninstalling the standalone version of MonoDevelop.

What is the current version of Mono so I can d/l and install.

I have uninstalled / reinstalled unity 3.5 (rebooted) several times.

win 7 sp1
unity 3.5