TRAPS: This question isn't as aggressive as it sounds. It represents the interviewer's own dilemma
over this common problem. He's probably
leaning toward you already and, for reassurance, wants to hear what you have to
say on the matter.
BEST ANSWER: Help him
see the qualifications that only you offer.
Example: "In
general, I think it's a good policy to hire from within when possible. But the very fact that you decided to look
outside probably means you're not completely comfortable choosing someone from
inside.