Which of the following correctly shows the pluralization for words ending in '-is'?

The pluralization of words ending in '-is' typically involves changing the ending to '-es.' This is a common rule in English for Latin-derived terms; for example, the word 'thesis' becomes 'theses,' and 'crisis' becomes 'crises.'

This rule helps maintain the correct pronunciation and form of the word as it transitions to plural. Recognizing this pattern is crucial, particularly in medical terminology, where many terms are derived from Latin and Greek.

Other pluralization methods, such as simply changing to 'a', 'is', or 'ies', do not apply to words ending in '-is' and can lead to incorrect forms. Understanding this specific pluralization rule enhances your grasp of the medical vocabulary used in practice.