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Can anyone state the rule for proper usage of a or an? I know you use "a" when the noun you are referring to begins with a consonant and use "an" when the noun you are referring to begins with a vowel. However, is there a rule that applies to usage of a or an when it pertains to the below?
This is an 84-year-old female, who has a history of dementia - OR
This is a 84-year-old female, who has a history of dementia.
Thanks,
bfp