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What is alopecia?
Dandruff
Hair loss
Hair thinning
Scalp infection
The correct answer is: Hair loss
Alopecia is a condition that refers to hair loss rather than dandruff, hair thinning, or a scalp infection. Dandruff is a common scalp condition characterized by flaking skin, but it is not the same as alopecia. Hair thinning is a different condition where the hair becomes thinner but does not necessarily result in complete hair loss like alopecia. Scalp infection involves the inflammation or infection of the scalp, which is also distinct from alopecia. Overall, alopecia specifically denotes the loss of hair, making it the correct answer in this context.