Explanation:

- Kadri Gopalnath was a pioneering musician known for popularizing the saxophone in Indian classical music.

- Saxophone: Kadri Gopalnath was indeed associated with this instrument. He was celebrated for his ability to adapt the saxophone to the requirements of Carnatic music.

- Sitar: This is a plucked string instrument well-known in Indian classical music but not associated with Kadri Gopalnath.

- Tabla: These are percussion instruments common in Indian classical music, but Kadri Gopalnath was not known for playing them.

- Flute: A classical wind instrument used in various music genres, but not Gopalnath's instrument of expertise.