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:
Living cells have at least ____ parts.\Question: Choose the right answer from options given a) seven b) three c) zero d) four

Ex Output:
b


Ex Input:
Reliability affects the production of goods in ____ distinct ways.\Question: Choose the right answer from options given a) one b) eight c) six d) three

Ex Output:
d


Ex Input:
Japan is home to ____ bear parks, in which bears are confined to concrete pits.\Question: Choose the right answer from options given a) eight b) five c) seven d) two

Ex Output:

a