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:
Fats come in ____ different forms saturated and unsaturated.\Question: Choose the right answer from options given a) no b) two c) six d) seven

Ex Output:
b


Ex Input:
Human feet bear average five to ____ hundreds tons of weight everyday.\Question: Choose the right answer from options given a) six b) eight c) five d) nine

Ex Output:
a


Ex Input:
Yeast exist in ____ mating types, a and .\Question: Choose the right answer from options given a) three b) two c) six d) five

Ex Output:

b