i think OP is actually asking for the ANSWERS to the interview questions rather than question itself.
there are no right or wrong answers. you just have to be youself!
simply stating answers that anyone can say ex)why dentistry? -- wanna help people. won't help interviewer to remember you as standout character.
so look at the questions from sdn. sit down, have cup of tea, and really just think about them.
Good luck,