The eggshell skull rule means a defendant must take the victim as found, so that an unusually severe outcome flowing from the victim's own vulnerability does not reduce liability. The question asks which listed scenario is NOT an illustration of that rule, which means looking for the option where the extra harm comes from someone else's independent wrongdoing rather than the victim's pre-existing frailty.
Because the needle scenario is explained entirely by the surgeon's own negligent act rather than by the patient's pre-existing weakness magnifying an otherwise minor injury, it stands apart from the other three scenarios, each of which depends on the victim's frailty.
Therefore, the correct answer is 'A' underwent an appendectomy and it was later discovered that a needle had been left inside her abdomen.