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:
Embrasures have ____ functions.\Question: Choose the right answer from options given a) three b) seven c) zero d) nine

Ex Output:
a


Ex Input:
Influenza epidemics are ____ times more likely during solar maxima.\Question: Choose the right answer from options given a) ten b) eight c) no d) four

Ex Output:
d


Ex Input:
Babies usually start sleeping through the night sometime between eight weeks and ____ months of age.\Question: Choose the right answer from options given a) four b) seven c) two d) six

Ex Output:

d