Task: Question Answering
Input (English): A species of bird has not been seen since the 1900s and is considered extinct. Which evidence would best disprove the claim that the bird is extinct?  
 (A) A bird watcher makes a sketch of the bird. (B) A scientist discovers fossil remains of the bird. (C) A researcher takes a photograph of the bird. (D) A park ranger finds a suitable habitat for the bird.
Output (English): C