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: Cows can be up to ____ times more active than normal while in heat.\Question: Choose the right answer from options given a) eight b) nine c) two d) six
Example Output: a

Example Input: Turkish citizens can enter Bosnia and stay up to ____ months without a visa.\Question: Choose the right answer from options given a) five b) seven c) four d) three
Example Output: d

Example Input: Veterinary experts estimate that nearly ____ in five adult dogs suffers from osteoarthritis.\Question: Choose the right answer from options given a) eight b) no c) two d) one
Example Output:
d