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:
Plants have at least ____ sHSP gene families which comprise a large multigene family.\Question: Choose the right answer from options given a) zero b) eight c) five d) seven

Ex Output:
c


Ex Input:
Mammals have only ____ sets of teeth.\Question: Choose the right answer from options given a) six b) five c) seven d) two

Ex Output:
d


Ex Input:
Most miscarriages occur in the first ____ months of pregnancy.\Question: Choose the right answer from options given a) zero b) three c) seven d) four

Ex Output:

b