Of these options, only the appendectomy with peri-appendiceal abscess involves spilled or infected contents. Its closest lecture examples are gangrenous appendix (contaminated) and abscess (dirty).

• Hernia repair and thyroidectomy are clean.
• Elective cholecystectomy is clean-contaminated.

Strictly, an established abscess is classed as 'dirty' in the lecture table, but B is still the only option beyond clean-contaminated.