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: Government buildings fly flags of the ____ nations.\Question: Choose the right answer from options given a) ten b) no c) seven d) two
Example Output: d

Example Input: Ruminants have an even number of toes on each foot and a stomach with either three or ____ chambers.\Question: Choose the right answer from options given a) four b) two c) seven d) five
Example Output: a

Example Input: Direct variation is when ____ variables vary directly.\Question: Choose the right answer from options given a) four b) two c) zero d) three
Example Output:
b