X, a customer of a popular bank had deposited an amount of Rs. 12500 in his savings bank account, which was credited by the bank in the account of Mr. Y. The relationship between the bank and Y is

In case of loan/advance accounts, banker is the creditor and the customer is the debtor. It is because the customer owes money to the banker. The banker can demand the repayment of loan/advance on the due date and the customer has to repay the debt. Here, bank is crediting the amount in Y's account, thus the relationship is of creditor and debtor.