Explanation:

- Option 1, Flute: The flute is a popular wind instrument across various musical traditions. It requires blowing air across an opening to create sound.

- Option 2, Nadaswaram: This is a classical wind instrument from South India, recognized for its loud and auspicious sound, often played in temple ceremonies.

- Option 3, Ghatam: The ghatam is a percussion instrument made of clay, widely used in South Indian music. It’s played by striking the surface with fingers.

- Option 4, Pakhawaj: The pakhawaj is a barrel-shaped, two-headed drum, used traditionally in Indian classical music, often accompanying dhrupad style vocalists.

Option 4, Pakhawaj: Totaram Sharma is indeed an exponent of the pakhawaj.