I'm conducting a survey related to health care. You can describe yourself using 3 categories: a client, a doctor or "a client and (a) doctor." I'm wondering if I should repeat the second "a" before the noun "doctor" or omit it because I've already used it before the noun "client."
When you have a list of single nouns, you can use a only for the first noun and omit it for all subsequent nouns.
There are an apple, pear, plum and peach on the table.
So, you can say a client and doctor. But you can still use a client and a doctor - it may even sound better if it's not in a sentence. On the other hand, in surveys, it may be good if all is made as short as possible.
Or you can say a patient and doctor, if you think this is appropriate to say in your survey.