I want to show a DropDown that should display two values in two columns. I want in HTML or CSS.
You won't be able to do this with HTML and CSS only. You will have to use script also.
Here is a jQuery based drop down
mcDropdown jQuery Plug-in v1.2.10
You can also check this one
38 jQuery And CSS Drop Down Multi Level Menu Solutions
Mega-dropdown? Check this example; Tutorial here.