Explanation:

- Option 1: Virender Sehwag

- Sehwag is the only Indian cricketer to have scored two Test triple centuries. His first was against Pakistan in 2004, and his second was against South Africa in 2008.

- Option 2: Virat Kohli

- Kohli has many accolades in Test and limited-overs cricket, but he has not scored a triple century in Tests.

- Option 3: Karun Nair

- Nair has scored a triple century in Tests, but only once. He achieved this against England in 2016.

- Option 4: Sunil Gavaskar

- Gavaskar was a prolific Test batsman but did not score any triple centuries in his career.