Concept:The money market deals only with short-term borrowing and lending.
Institutions that provide long-term loans do not operate there.
Explanation:Mortgage banks mainly give long-term loans for buying or building houses.
These loans last far beyond the short-term period of the money market.
Therefore, mortgage banks do not belong to the money market.
The central bank, money deposit banks, and insurance companies all take part in short-term money market activities.
They lend, borrow, or invest in short-term instruments.
So the institution that does not operate in the money market is the mortgage bank.
Answer:B. mortgage banks