Shouldn't there be an article in front of a Noun?

[Hemm]

English Language Tests, Intermediate level

ESL/EFL Test #270 "Literary Terms (2)", question 1

A(n) ......... is story where a person writes about themselves and their own life story.

(a) biography
(b) autobiography
(c) play

English Language Tests, Intermediate level

ESL/EFL Test #270 "Literary Terms (2)", answer 1

A(n) autobiography is story where a person writes about themselves and their own life story.

Correct answer: (b) autobiography
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Shouldn't there be an article in front of a Noun?

Hemm

[Yankee]

No, Hemm, an article is not always necessary in front of a noun.
However, the article 'a' is necessary in front of the (first) word 'story' in this sentence. Thanks for alerting us.
.