Task: Question Answering
Input (English): Astronomers have found evidence for the existence of a super-massive black hole in the center of the giant elliptical galaxy M87. What is thought to cause black holes to form?  
 (A) the death of a low-mass star (B) the gravity of a large nebula (C) the collapse of a high-mass star (D) the combining of material from planets
Output (English): C