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:
Chacoan peccaries are the largest of the ____ peccary species.\Question: Choose the right answer from options given a) eight b) three c) ten d) no

Ex Output:
b


Ex Input:
Reverse osmosis uses ____ to ten gallons of water to produce one gallon of drinking water.\Question: Choose the right answer from options given a) two b) zero c) five d) three

Ex Output:
d


Ex Input:
Many people can breathe in pollen, dust, and pet dander with ____ signs of allergies.\Question: Choose the right answer from options given a) seven b) two c) no d) ten

Ex Output:

c