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:
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:
Gestation lasts ____ months, with the birth of a single calf.\Question: Choose the right answer from options given a) three b) one c) six d) eight

Ex Output:
d


Ex Input:
Monkeys are classified into ____ distinct groups.\Question: Choose the right answer from options given a) ten b) nine c) one d) two

Ex Output:

d