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:
Chemistry has ____ less important names.\Question: Choose the right answer from options given a) ten b) no c) eight d) nine

Ex Output:
b


Ex Input:
Some homeopathic remedies are so dilute, ____ molecules of the healing substance remain.\Question: Choose the right answer from options given a) ten b) three c) one d) no

Ex Output:
d


Ex Input:
Green dots are signals detected ____ or more times.\Question: Choose the right answer from options given a) one b) eight c) ten d) four

Ex Output:

d