You might like to change your display name to "Gopu Lilly".
However, in answer to your question, your problem lies in that you've defined a hardcoded display. In real life, you'd normally be setting the display from a backing bean and probably setting the backing bean from the display as well.
The default value would be whichever value you'd initialized carBean.currentCar to. I've copied an example that uses the selectItems tag instead of individual selectItem's, but operation is identical.