I remember reading a short 100 page medical ethics book really helped. It gave ethical scenarios and gave the reasons why they chose to do what they did, why it was ethical, they also gave unethical situations to teach you what not to do(think of it like a case book for medical ethics). that really helped, I obviously didn't memorize it, however I had a general idea of what constitued as ethical in medicine, I was able to identify when something was ethical, and generally what I should do in a situation. You can use different phisophical theories if you really wanted(but I didnt do that). When you are on interviews, avoid the straw-man argument. Even if you prove your point soundly, if you didn't provide any counter evidence then you are using the straw man argument. So after you are done, it may be good to add, although in my opinion this is what I would do, arguably someone could take issues with these aspects of what I said. This shows you are introspective, critical of what you have done right and wrong, it shows a lot, it shows you care about your mistakes. So DONT use straw man