not only that, the writer identified himself as pro-life from the get-go and the purpose of that entire blog post has nothing to do with this inherent interview question.
even in his blogpost, you can see that medical school faculty are opposed to such a strict stance on not referring a patient based on personal belief. remember that medical school faculty will be the ones interviewing you. its embarrassing enough to sit a med student down and have this conversation, so do not try to be a smartass and get yourself rejected. do not make it any more than what the university of washington website on bio-ethics.
you are free to have any opinion on this situation. however, your answer could restrict if/where you get into medical school. many of you may will never end up in a situation like the question actually presented. but if you want to practice medicine, for whatever reason, i personally would answer professionally to increase the chances that i will succeed in my original pursuits.