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:
Circumcisions usually heal within ____ to two weeks.\Question: Choose the right answer from options given a) one b) five c) eight d) nine

Ex Output:
a


Ex Input:
Reliability affects the production of goods in ____ distinct ways.\Question: Choose the right answer from options given a) one b) eight c) six d) three

Ex Output:
d


Ex Input:
Zeolites have basically ____ different structural variations.\Question: Choose the right answer from options given a) ten b) seven c) two d) three

Ex Output:

d