A line intersects the y-axis and x-axis at a point P and Q respectively. If (2,-5) is the midpoint of PQ, then the coordinates of P and Q are :
a. (0, -5) and (2,0)
b. 0, 10) and (-4, 0)
c. (0,4) and (-10,0)
d. (0,-10) and (4, 0)