Medical accidents: Those who are diagnosed, treated, or neglected by medical staff during medical treatment and nursing work will directly cause death, disability, and damage to organs and tissues, resulting in functional dysfunction, which is called a medical accident. According to the above definition, which of the following situations is a medical accident? ["Xiao Li is an intern. During the emergency rescue of patients one day, he did not ask for instructions from his superiors, and blindly dealt with almost the crisis that caused the patient's life. Fortunately, the superior doctors discovered the corrections in time, and the patients were out of danger.", "Yu Fen's appendectomy was performed by Dr. Zhang in a large hospital due to acute appendicitis. There was no discomfort during the postoperative hospital stay, but on the third day after discharge, Yu Fen's wounds became purulent and ulcerated, and the wounds did not heal.", 'Ding has no previous history of drug allergies. Recently, he was infused with a certain skin-free antibiotic in the emergency observation room due to fever. During the infusion, he experienced mental abnormalities, did not speak, did not know loved ones, behaved strangely, and was impulsive.', "A taxi driver fled the scene after the accident. The victim was penniless and was sent to a nearby hospital for emergency treatment by the surrounding people. The patient refused to accept the patient because he had no cash payment and emphasized that the hospital's rescue equipment was insufficient. Died of major blood loss on the way."]