The correct answer is that there is not enough information given in the question (as jenstar explained). In fact, there is no house at the North Pole, and any house built there would be unstable - both in terms of the foundations on which it is built (sea ice) - and in terms of its location (it would drift a few metres away from the North Pole within a few years). In any case, it is highly unlikely that a polar bear would go anywhere near the North Pole, as its livelihood depends on hunting at the edge of the ice where the ice is thin. As such, the most likely answer is that it is probably a brown bear walking past an unusual house of the type suggested by jenstar.