In article .com,
Bucky wrote:

I have fruit flies coming out of the bathroom sink drain. They do not
come out of any other drains in the house. Should I call a plumber or
pest control for this problem? Anyone resolve a similar problem to this
before? Thanks.

They're probably in the overflow, and that means there's stuff in there
they're eating. Yuck.

I'd consider this a strong sign you should replace the sink.