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:
Beavers live in families that include an adult pair and ____ to three years worth of offspring.\Question: Choose the right answer from options given a) no b) one c) four d) ten

Ex Output:
b


Ex Input:
Ants have ____ noses.\Question: Choose the right answer from options given a) zero b) eight c) five d) three

Ex Output:
c


Ex Input:
Healthy people recover rapidly in two to ____ days.\Question: Choose the right answer from options given a) five b) ten c) nine d) four

Ex Output:

a