Task: Question Answering
Input (English): 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 
 Option1: less useful isotope? 
 Option2: more useful isotope 
 Explanation: Because these isotopes decay more slowly, they can be used to date much older specimens.
Output (English): less useful isotope?