Explanation:

- Option 1: Karun Nair

- Known for scoring a triple century in Test cricket.

- Achieved this milestone against England in 2016.

- However, he has not scored more than one triple century.

- Option 2: Virender Sehwag

- ?? Correct Answer

- Scored two triple centuries in Tests.

- First against Pakistan in 2004 (309).

- Second against South Africa in 2008 (319).

- Option 3: Virat Kohli

- Known for numerous Test double centuries.

- Has not scored a triple century in Test cricket.

- Option 4: Sunil Gavaskar

- Legendary Indian batsman.

- Never scored a triple century in Tests.