What type of questions do they ask at an medical interview at Oxford?

The questions they ask in medical interviews at Oxford differ from the questions you get asked at most other universities. For most universities, you can generally prepare answers beforehand since they're all fairly general and usually involve asking you to provide an example of when you showed a certain skill, testing your knowledge of current medical issues, or might involve some medical ethics. Though they do ask these types of questions at Oxford sometimes, the majority of the questions you'll get asked are much more academic and scientific in nature and involve a lot more thinking on the spot, which you can't really prepare for in advance.
For example, a question I got asked was: "What is cancer?" While obviously immensely daunting at first, I tried to give a rough definition of cancer from what I had learnt from school and from my general knowledge, before trying to take a more scientific approach by going through the phases of the cell cycle. I was asked why cancer is bad, which I had never really thought of before (sounds stupid, I know), since it was something that I just assumed and thought everybody else did the same. This led the discussion towards malignancy and metastasis, which I knew a bit about from watching a 5 minute TED-Ed video. I was then asked how I would cure cancer - another difficult question which I hadn't thought about, but the tutors gave me some help and I managed to come up with a mechanism by which a current chemotherapy drug actually works!