Which of the following is NOT a classification of surgery?

The classification of surgery encompasses various categories based on the timing and urgency of the procedure, as well as its purpose. Elective surgery is performed at the convenience of the patient and the healthcare provider, typically for non-life-threatening conditions. Diagnostic surgery is performed to obtain information about a condition, such as a biopsy. Acute surgery refers to urgent procedures necessary due to sudden medical conditions, like appendicitis.

In contrast, 'chronic' does not fit within the classifications of surgical procedures. While it describes a long-term condition or disease process, it does not denote a category of surgery. Therefore, identifying chronic as not a classification of surgery is accurate, as this term is used to characterize the nature of a disease rather than the timing or type of surgical intervention.