Given a sentence with a missing word, pick the answer option that best fills out the missing word in the sentence. Indicate each answer with its index ('a', 'b', 'c', 'd').

Example Input: Children now account for only ____ percent of all forest fires caused in the United States.\Question: Choose the right answer from options given a) five b) four c) eight d) nine
Example Output: b

Example Input: Today there are ____ UK hospitals doing heart transplants.\Question: Choose the right answer from options given a) three b) five c) six d) nine
Example Output: d

Example Input: Tattoos can take up to ____ weeks to heal.\Question: Choose the right answer from options given a) seven b) six c) eight d) nine
Example Output:
b