Task: Question Answering
Input (English): People without safe drinking water may get an illness called dysentery. Dysentery is caused by a type of amoeba that lives inside the body. Doctors can find these amoebas by looking at body samples under a microscope. Which characteristic of amoebas best explains why doctors use microscopes to find dysentery amoebas?  
 (A) Amoebas can change their shape. (B) Amoebas need humans to survive. (C) Amoebas look just like human cells. (D) Amoebas are made of only one cell.
Output (English): D