The nurse is caring for a client admitted to the emergency department after a motor vehicle accident. Under the law, the nurse must obtain informed consent before treatment unless

A. the client is mentally ill.
B. the client refuses to give informed consent.
C. the client is in an emergency situation.
D. the client asks the nurse to give substituted consent.

为维护房屋租赁市场秩序，保证国家关于房屋租赁的市场税收，当事人签订、变更、终止租赁合同，均应当向房屋所在地（）登记备案。

A.市、县人民政府房地产管理部门

B.直辖市、市人民政府房地产管理部门

C.直辖市、市、县人民政府房地产管理部门

D.区、县人民政府房地产管理部门