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:
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:
Most ovarian cysts go away on their own in ____ to three months without causing any problems.\Question: Choose the right answer from options given a) one b) ten c) five d) eight

Ex Output:
a

Ex Input:
Vegans eat only plant foods, ____ eggs or dairy products.\Question: Choose the right answer from options given a) seven b) ten c) nine d) no

Ex Output:
d