Refer to the given diagram where X and Y represent substances while P and Q represent organs.
Which of the following best represents organs P and Q; and substances X and Y?
Organ P---Organ Q---Substance X---Substance Y
ASmall intestine---Pancreas---Water---Undigested food
BLarge intestine---Small intestine---Digested food---Water
CLarge intestine---Anus---Digested food---Water
DSmall intestine---Large intestine---Digested food---Undigested food