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:
Reverse osmosis uses three to ____ gallons of water to produce one gallon of drinking water.\Question: Choose the right answer from options given a) six b) eight c) five d) ten

Ex Output:
d


Ex Input:
Wolves are large dog-like animals whose head and body length, combined, is about ____ feet.\Question: Choose the right answer from options given a) five b) four c) nine d) one

Ex Output:

b