Under the traditional classification of Indian musical instruments, aerophones (wind-based instruments) are classified under which of the following categories?

The correct option is Sushir Vadya.

In traditional Indian musicology (as classified in ancient texts such as Bharata Muni's Natya Shastra), musical instruments (Vadya) are categorized into four primary groups based on their acoustic principles and method of sound production:

1. Sushir Vadya (Aerophones / Wind Instruments):
Sound is generated by the oscillation of an air column inside a tube or pipe when air is blown into it. Examples include the Bansuri (flute), Shehnai, Harmonium, and Nadaswaram.

2. Tat Vadya (Chordophones / Stringed Instruments):
Sound is produced by vibrating stretched strings, which may be plucked, bowed, or struck. Examples include the Sitar, Veena, Sarod, and Tanpura.

3. Avanaddha Vadya (Membranophones / Percussion Instruments with Membranes):
Sound is produced by striking a stretched animal hide or membrane fitted over a resonant vessel or frame. Examples include the Tabla, Mridangam, Dholak, and Pakhawaj.

4. Ghan Vadya (Idiophones / Solid Percussion Instruments):
Sound is created by striking solid materials (metal, wood, or clay) that resonate directly without using stretched membranes or strings. Examples include Manjira (cymbals), Ghatam, Jal Tarang, and Khartal.

Hence, aerophones or wind-based instruments are classified under Sushir Vadya.