Answer:
Central Bank
Step-by-step explanation:
A public authority that provides banking services to commercial banks and regulates financial institutions and markets is called a "Central Bank".
A Central Bank oversees the activities of commercial banks and creates regulations in order to control the activities of financial institutions.
Every commercial bank is answerable to the Central bank. This enables the central bank to provide the services needed by the commercial banks.
The Central bank is the apex financial institution.