The following sentence has been split into four segments. Identify the segment that contains a grammatical error.
He is / an expert / in / an English literature.

Correct option is A

Option (a) contains an error.
· The phrase "an English literature" is incorrect because "literature" is an uncountable noun and does not require an article ( an or a).
· The correct phrase should be "English literature" without any article.
Grammatical rule used:
· Uncountable nouns like literature, information, advice, furniture do not take indefinite articles ( a/an).
· Example: ❌ She is studying an mathematics. → ✅ She is studying mathematics.