Correct answer:

The acutely inflamed appendix may resolve, but if so a further attack is likely. It is not uncommon for a patient with acute appendicitis to confess to one or more previous milder episodes of pain, the ‘grumbling appendix’. More often the inflamed appendix undergoes gangrene and then perforates, either with general peritonitis or, more fortunately, with a localized appendix abscess.