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').

Ex Input:
Cats have ____ sets of vocal cords.\Question: Choose the right answer from options given a) zero b) nine c) two d) three

Ex Output:
c


Ex Input:
Cougars have ____ toes with three distinct lobes present at the base of the pad.\Question: Choose the right answer from options given a) no b) four c) eight d) zero

Ex Output:
b


Ex Input:
Canids only have ____ toes.\Question: Choose the right answer from options given a) ten b) two c) no d) four

Ex Output:

d