javascript - Required Drop Down Box in html5 form

Following is my code from dropdown. I am trying to make sure that person has to select option from dropdown but not "Please select an option...". I can submit form without giving me error. I want to sent error that please select option if person has not selected any option from dropdown.

    Contact Type:
    
        Phone
        Meeting
        None
        Please select an option...
    

New in HTML. What should I do ? I don't mind using jquery or javascript for solution.

Thanks