Concept:
Bihu is a traditional folk dance associated with festivals and cultural celebrations in India. It reflects the agricultural lifestyle and traditions of a specific region.
Step 1: Understand Bihu dance.
Bihu is performed during the Bihu festival, which marks the Assamese New Year and harvest season.
Step 2: Identify the state.
This dance form originates from the state of Assam in northeastern India.
Step 3: Evaluate the options.
- West Bengal $\rightarrow$ Known for other dances like Gambhira (incorrect)
- Assam $\rightarrow$ Famous for Bihu (correct)
- Odisha $\rightarrow$ Known for Odissi dance (incorrect)
- Manipur $\rightarrow$ Known for Manipuri dance (incorrect)
Step 4: Conclusion.
Thus, Bihu is a folk dance of Assam.