The keeper of the spring cleared away the leaves and branches, and wiped away the silt(淤泥) that would _______ have choked and polluted the fresh flow of water.

A．thus

B．otherwise

C．therefore

D．later

某市工商局把没收的假药卖给当地某医院，该医院出售这批假药时被市卫生局发现，经查实对市工商局及医院分别进行了行政处罚，本案中的行政主体是（）

A、市工商局

B、医院

C、市人民政府

D、市卫生局