To determine which instrument is typically associated with 'Chautala', we need to explore the characteristics and context of the instruments given in the options.
Pakhawaj: The Pakhawaj is a traditional Indian percussion instrument similar to the tabla but larger, and is used in the north Indian classical music tradition. It is a barrel-shaped drum with two heads and is often played in the Dhrupad style of music. Chautala is a rhythmic cycle commonly used in Dhrupad music, which consists of 12 beats per cycle. The Pakhawaj is commonly associated with the Chautala rhythm.
Tabla: The Tabla is another percussion instrument, consisting of a pair of hand-played drums, traditionally used in Hindustani classical music. However, it is associated more with lighter forms of classical music and lighter taal cycles, such as Teentaal and Jhaptaal, rather than Chautala.
Sitar: The Sitar is a string instrument famous in Indian classical music. It is unrelated to rhythmic cycles directly, as it provides melodic lines rather than rhythm patterns.
Harmonium: The Harmonium is a hand-pumped reed instrument, often used to accompany vocals in Indian music. It is usually not associated with specific rhythmic cycles like Chautala.
Given this analysis, the correct answer is Pakhawaj, as it is the instrument typically associated with performing Chautala.