Obsessive-compulsive disorder is a type of neurotic disorder characterized by recurring obsessive thoughts. Obsessive-compulsive thoughts are thoughts, representations, or intentions that repeatedly enter the patient's field of consciousness in a stereotyped form.  For the patient, these thoughts, representations, or intentions have no practical significance, and they are unnecessary or redundant; the patient realizes that these are his own thoughts, and wants to get rid of it but fails, so he feels very distressed.
According to the definition, which of the followings may be classified as obsessive-compulsive disorder?
Although he made sure that he brought the book, Xiao Huang still can't help checking it several times on the road.