Please see if I have the correct answer thank you

The patient went into cardiac arrest. The- (iac) portion of the word is

A. noun suffix
B. plural suffix
C. combining form
D. adjective suffix

My choice is B

Plural means more than one, so B is out.

What is "cardiac" in that sentence? A noun, an adjective, or what? Once you know its function, you'll know what the answer is.

Actually, the correct answer is C. combining form. The "iac" portion of the word "cardiac" is a combining form.

To determine the correct answer, it's helpful to understand the definition of each option:

A. Noun suffix: A suffix that is added to a base word to form a noun.
B. Plural suffix: A suffix that is added to a base word to indicate that it is plural.
C. Combining form: A form that combines with another form to create a compound word.
D. Adjective suffix: A suffix that is added to a base word to form an adjective.

In the case of "cardiac," the combining form "iac" is combined with the base word "card-" to form the complete word "cardiac." Therefore, the correct answer is C. combining form.