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:
Some programming languages have ____ or more standards.\Question: Choose the right answer from options given a) no b) seven c) two d) three

Ex Output:
c

Ex Input:
Mechanical digestion occurs as ____ strong layers of muscle contract to produce a churning motion.\Question: Choose the right answer from options given a) four b) no c) three d) six

Ex Output:
c

Ex Input:
Milk has ____ fiber.\Question: Choose the right answer from options given a) five b) two c) one d) zero

Ex Output:
d