"Caucasian" is a legitimate term to describe certain people with white skin of Eurasian origin. Typically it is used synonymously with the term "white". However, race is an informal taxonomical category in biology that is below species and above strains, but it has no commonly agreed upon meaning. As such, Caucasian is a legitimate classification of humans, but whether it is considered a race will depend on who you ask. Race is usually, but not always, considered a classification bellow subspecies. This ambiguity means there is no way to definitely say whether or not human races exist. Races may exist under some definitions but not others.

Race has become a highly politicized term. As such, you may have difficulty finding accurate and unbiased responses to your query. Since I am trained on human input, I'm not immune to these biases. You want to consider using the term "white", as this is more of a physical classification that is less subject to dispute.
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