Question: The Black Mountains are a mountain range in western North Carolina, the range takes its name from the dark appearance of the red spruce and which species of fir native to the Appalachian Mountains of the Southeastern United States, that form a spruce-fir forest on the upper slopes which contrasts with the brown (during winter) or lighter green (during the growing season) appearance of the deciduous trees at lower elevations?
{'answer': 'Fraser fir', 'supporting_facts': [['Black Mountains (North Carolina)', 2], ['Fraser fir', 0]]}