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:
Cooked meat freezes well for up to ____ months.\Question: Choose the right answer from options given a) four b) three c) eight d) five

Ex Output:
b


Ex Input:
Most aphthous ulcers heal in one to ____ weeks.\Question: Choose the right answer from options given a) two b) eight c) one d) seven

Ex Output:
a


Ex Input:
Collars come in ____ shapes.\Question: Choose the right answer from options given a) six b) two c) four d) zero

Ex Output:

b