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: Islamic practice is based on what are called the ____ pillars of faith.\Question: Choose the right answer from options given a) eight b) one c) five d) four
Example Output: c

Example Input: Many comets have ____ tails.\Question: Choose the right answer from options given a) two b) six c) three d) one
Example Output: a

Example Input: Peccaries have a complex stomach that contains ____ compartments.\Question: Choose the right answer from options given a) two b) six c) four d) one
Example Output:
c