In the diagram, points U,V,W,X,Y, and Z lie on a straight line with UV=VW=WX=XY=YZ=5. Semicircles with diameters UZ,UV,VW,WX,XY, and YZ create the shape shown. What is the area of the shaded region?
Answer Choices
A. \frac{325\pi}{4}
B. \frac{375\pi}{4}
C. \frac{325\pi}{2}
D. \frac{625\pi}{4}
E. \frac{625\pi}{2}