What is the namespace for SelectList in ASP.Net 5?

I am putting together a Web application using asp.net 5, mvc 6 and am unable to locate the namespace/package for SelectList.  From my reading I found that in previous versions (ASP.Net 4 and earlier) that the namespace was System.Web.mvc.  However, for asp.net 5 the documentation states that the namespace is: Microsoft.AspNetCore.Mvc.Rendering.

While looking for Nuget Package I am not seeing Microsoft.AspNetCore.Mvc.Rendering as being available.  

Any help on this will be very much appreciated.

Thanks!