What is the fine-grained topic of the following text: Then, one day, on Feb. 12, 2014, he slipped and fell on that ramp while making his “second or third trip” up and down it, and that triggered his filing a lawsuit against the hospital for their negligence in failing to de-slipperize the ramp. Only return the topic.
A lawsuit against a hospital for negligence leading to a slip-and-fall accident