Task: Question Answering
Input (English): In the 20th century, Edwin Hubble deduced from observations that there are galaxies other than the Milky Way. Hubble's observations depended on improvements in a technology first developed by which scientist?  
 (A) Democritus (B) Isaac Newton (C) Galileo Galilei (D) Anton Van Leeuwenhoek
Output (English): C