Given this paragraph about Choro music style, what are the instruments usually used to play Choro ?

Originally choro was played by a trio of flute, guitar and cavaquinho (a small chordophone with four strings). Other instruments commonly played in choro are the mandolin, clarinet, saxophone, trumpet and trombone. These melody instruments are backed by a rhythm section composed of 6-string guitar, 7-string guitar (playing bass lines) and light percussion, such as a pandeiro. The cavaquinho appears sometimes as a melody instrument, other times as part of the rhythm.

Usually, choro is played by a flute, guitar and cavaquinho but other instruments are commonly played as the mandolin, clarinet, saxophone, trumpet and trombone. Also, to back the melody, a 6-string guitar, a 7-string guitar and a pandeiro are present. Finally, the cavaquinho appears as a rhythm or melody instrument.