Carrots are always orange.
Why it is true
The original carrots were purple or yellow. The orange variety was developed in the Netherlands in the 17th century, probably in honour of the House of Orange. Today there are purple, white, yellow and even red carrots.
Source: Journal of Food Science
Would you rather be asked first?
This is the reading side of the site, so the answer is in the sentence above — that is the whole point of it. Test yourself works the other way round: the question comes on its own, and the fact and the explanation only appear once you have answered.