Obsessive-compulsive disorder: A neurosis that manifests obsessive-compulsive ideas and compulsive movements as its main manifestation. It is characterized by the simultaneous existence of conscious self-compulsion and conscious self-compulsion. Repeatedly appears restrained. According to the above definition, which of the following is obsessive-compulsive disorders? ['Model Xiao Zhang recently forced herself to eat less whenever she attended a party in order to maintain a slim figure.', 'After the Spring Festival, high school student Xiao Chen wants to hang out with his classmates and has to force himself to read at home in order to get a good university.', 'Every time Ms. Lin walked out of the gate, she suspected that her gas was not turned off or the door was unlocked, so she returned to check.', 'Introverted Li wants to confess to the girl she likes, but she is also afraid of being rejected. She thinks repeatedly throughout the night that she cannot sleep.']