Concept:The central bank is the apex monetary authority responsible for issuing currency and maintaining financial stability.Explanation:A central bank has the sole right to issue the national currency.Production of goods is carried out by producers, not by the central bank.Presenting budgets is the duty of the government or ministry of finance.Cheque books are provided by commercial banks to their customers.Hence, among the given options, issuing of currency is a true central bank function.Answer:B. issuing of currency