Leaking kitchen sink not reported until damage was extensive- Who pays for repairs?

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I have a sfh in NC that has been rented for a little less than a year. All pipes/plumbing were in working order when rented. Today I received a complaint that the the pipe under the kitchen sink has a leak and apparently has been leaking long enough to cause mold and the floor underneath to rot. Is this entirely the landlord's responsibility or is the tenant also partially responsible for damages for being negligent? Any advice would be greatly appreciated.