Shouldn't the preposition be 'an' instead of 'a' before euphemism?

[Emmanuil]

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #89 "Verbal Learning", question 9

He has a very refined vocabulary and prefers to use a ......... rather than a more common and vulgar word.

(a) euphemism
(b) delicacy
(c) finery
(d) edition

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #89 "Verbal Learning", answer 9

He has a very refined vocabulary and prefers to use a euphemism rather than a more common and vulgar word.

Correct answer: (a) euphemism

Your answer was: correct
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Shouldn't the preposition be "an" instead of "a" before "euphemism?

Emmanuil

[Mister Micawber]

.
'A' and 'an' are articles, not prepositions. 'A' is correct here because 'euphemism' starts with a /j/ sound. It is the sound, not the spelling, that determines indefinite article choice.

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Canadian-American native speaker
who teaches English for a living at Mister Micawber's
ESL cafe: Interview with Mister Micawber