Explanation:

- Pt Hariprasad Chaurasia is a renowned classical musician from India.

- He is best known for his expertise in playing the flute, specifically the bansuri.

- His contribution to Indian classical music is significant, especially in the Hindustani tradition.

- Option 1: Vocalist - This refers to someone who sings, which Pt Hariprasad Chaurasia is not known for.

- Option 2: Sitarist - A sitarist plays the sitar, an Indian stringed instrument. This isn't his expertise.

- Option 3: Flautist - This is the correct description for Pt Hariprasad Chaurasia.

- Option 4: Tabla-player - Tabla players specialize in playing the tabla, a type of drum, which he does not.