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:
Acoustic guitars come in ____ types.\Question: Choose the right answer from options given a) two b) ten c) one d) four

Ex Output:
a


Ex Input:
Distilled water enters the body with ____ minerals but leaves the body with minerals.\Question: Choose the right answer from options given a) zero b) no c) one d) nine

Ex Output:
b


Ex Input:
Some cheese can reach peak condition in a week, while others require up to ____ years of aging.\Question: Choose the right answer from options given a) seven b) five c) four d) eight

Ex Output:

b