Explanation:

- Ustad Sabri Khan was renowned for his exceptional skill in playing the sarangi, a traditional Indian string instrument.

- Option 1: Sarangi - The Sarangi is a bowed, short-necked string instrument from India, known for its resonant and emotive sound.

- Option 2: Flute - A woodwind instrument often used in classical and folk music, but it is not associated with Ustad Sabri Khan.

- Option 3: Santoor - A hammered dulcimer instrument often used in Indian classical music. While it has its virtuosos, it is not related to Sabri Khan.

- Option 4: Sarod - A stringed instrument used in Indian classical music, known for its deep, weighty sound. Sabri Khan did not play this instrument.