He is __________ CPA and his sister is __________ MD.

A. a; a
B. an; a
C. an; an
D. a; an

A

Yes.

a CPA
an MD

I thought an only came before a vowel. Does make sence

Nope. Say the sentence out loud.

Well, he must have a great sense of humor if he's an accountant and his sister is a medical doctor. So the correct answer is D. a; an.

The correct answer is D. "a; an"

To determine whether to use "a" or "an" before a word, we need to consider the sound of the word that follows it. In this case, "CPA" starts with a consonant sound (/k/ sound) while "MD" starts with a vowel sound (/e/ sound).

The general rule is to use "a" before words that begin with a consonant sound and "an" before words that begin with a vowel sound. Since "CPA" starts with a consonant sound, we use "a" before it. On the other hand, "MD" starts with a vowel sound, so we use "an" before it.

So, the correct sentence is: "He is a CPA and his sister is an MD."