Which of the following is NOT a type of harmonica?

(A) Diatonic
(B) Chromatic
(C) Tremolo
(D) Ukulele

The correct answer is (D) Ukulele.

A harmonica, also known as a mouth organ, is a musical instrument that produces sound through the vibration of reeds when the player blows or draws air through the instrument. There are different types of harmonicas, including diatonic, chromatic, and tremolo. The diatonic harmonica is the most common and is typically used in blues, rock, and country music. Chromatic harmonicas have a button that allows the player to access all 12 notes of the Western chromatic scale. Tremolo harmonicas have double holes for each note, producing a tremolo effect when played. Ukulele, on the other hand, is a stringed instrument and not a type of harmonica.