Does the using statement dispose only the first variable it create?

Let's say I have a disposable object MyDisposable whom take as a constructor parameter another disposable object.

using(MyDisposable myDisposable= new MyDisposable(new AnotherDisposable()))
{
     //whatever
}

Assuming myDisposable don't dispose the AnotherDisposable inside it's dispose method.

Does this only dispose correctly myDisposable? or it dispose the AnotherDisposable too?