Task: Question Answering
Input (English): Paragraph: Because these isotopes decay more slowly, they can be used to date much older specimens.
 Question: For dating the age of a fossil, and compared to the isotope Carbon 14 with its 5730 year half-life, would Francium with a 22 minute half-life be a 
 Choices: A)less useful isotope? 
B)more useful isotope
Output (English): less useful isotope?