A patient went into cardiac arrest. The (-ac) portion of the word cardiac is a/an

correct, but it is not necessary to post the same question twice.

To determine the answer to this question, let's break down the word "cardiac" and its parts.

"Cardiac" is an adjective that relates to or pertains to the heart. The root word in "cardiac" is "cardi-", which comes from the Greek word "kardia," meaning "heart." "-ac" is a suffix added to the root word "cardi-" to form the adjective "cardiac."

Now, we need to identify what type of suffix "-ac" is.

A noun suffix is added to the end of a word to create a noun (e.g., musician, employee).
A plural suffix is added to the end of a word to indicate more than one of something (e.g., cats, books).
A combining form is added to the beginning, middle, or end of a word to create a new word or alter its meaning (e.g., re-, pre-, -ectomy).
An adjective suffix is added to the end of a word to create an adjective (e.g., happy, dangerous).

Based on these options, the most appropriate choice for the suffix "-ac" in the word "cardiac" is D. adjective suffix, as it transforms the root word "cardio-" into an adjective form. Thus, the correct answer is D. adjective suffix.