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:
China has about ____ in four of all smokers in the world.\Question: Choose the right answer from options given a) one b) seven c) ten d) six

Ex Output:
a


Ex Input:
Carbon can bond to a maximum of ____ atoms.\Question: Choose the right answer from options given a) six b) ten c) five d) four

Ex Output:
d


Ex Input:
Early detection allows nine out of ____ women to survive breast cancer.\Question: Choose the right answer from options given a) no b) seven c) three d) ten

Ex Output:

d