Step 1: The Central Rice Research Institute (CRRI) at Cuttack, Odisha, has long been India's premier rice research centre under the Indian Council of Agricultural Research (ICAR).
Step 2: As part of ICAR's institutional restructuring, CRRI was renamed the ICAR-National Rice Research Institute (ICAR-NRRI) to reflect its elevated national mandate for rice research.
Step 3: CSIR-Regional Rice Research Institute is not a real designation, the International Rice Research Institute (IRRI) is a separate organisation headquartered in the Philippines, not the renamed Cuttack institute, and International Rice Breeding and Research Institute is not a real name.
Step 4: So the correct answer is ICAR-National Rice Research Institute.