设F(x，y)=xy+2lnx+3lny-1=0，则y'等于()

设F(x，y)=xy+2lnx+3lny-1=0，则y'等于()
A、-[y(xy+2)/x(xy+3)]
B、-[x(xy+2)/y(xy+3)]
C、-[x(xy+3)/y(xy+2)]
D、-[y(xy+3)/x(xy+2)]
【正确答案】：A