​Four words have been given, out of which three are alike in some manner and one is different. Select the odd one.​

HDFC, SBI, and ICICI are commercial banks that offer banking services to the public like loans, savings accounts, deposits, etc.

Whereas, RBI (Reserve Bank of India) is the central bank of India which regulates and monitors all banks, formulates monetary policies, and issues currency.

Thus, correct option is (C).