Step 1: Meaning of financial sector regulator.
Section 3(18) of the Insolvency and Bankruptcy Code, 2016 defines ‘financial sector regulator’.
Step 2: Regulators included.
The definition expressly includes RBI, SEBI, IRDAI, and the Pension Fund Regulatory and Development Authority.
Step 3: Exclusion.
The World Bank is an international financial institution and is not a statutory regulator under Indian law.
Step 4: Conclusion.
Hence, the correct answer is (B) World Bank.