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:
Vision disorders affect one in every ____ school-age children.\Question: Choose the right answer from options given a) five b) four c) nine d) one

Ex Output:
b


Ex Input:
Dicots have ____ seeds leaves, whereas monocots have only one.\Question: Choose the right answer from options given a) four b) one c) seven d) two

Ex Output:
d


Ex Input:
Triglycerides contain three fatty acid molecules and ____ glycerol molecule.\Question: Choose the right answer from options given a) nine b) no c) ten d) one

Ex Output:

d