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Nitration of aniline in strong acidic medium also gives m-nitroaniline because

1. Inspite of substituents nitro group always goes to only m-position.
2. In electrophilic substitution reactions, amino group is meta directive.
3. In acidic (strong) medium aniline is present as anilinium ion.
4. In absence of substituents, nitro group always goes to m-position.

Correct answer: In acidic (strong) medium aniline is present as anilinium ion.

Solution

In a strong acidic medium, aniline gets protonated to form the anilinium ion, which deactivates the benzene ring and directs the incoming nitro group to the meta position.

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