Make some options in a select menu “unselectable”

Question

I have a select element with a few options, but I want some of the options to not be selectable.

Basically it\'s like this:

Answer 1

There is a lot of option to make this happens, I recommend a plugin of jquery named Chosen:

It will be like:

                                                                                                               
    
     Here goes the option to select                                                                          
  
 

Here is the link, https://harvesthq.github.io/chosen/