HTML Form

Is it possible to have a <select> input item like this:

<select name="cars">
  <option value="1">1-Volvo</option>
  <option value="2">2-Saab</option>
  <option value="3">3-Opel</option>
  <option value="4">4-Audi</option>
</select>

And for example when a users picks 3-opel, the form only shows 3. So the dropdown most consist out of key and description. but once picked only the key.