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').

Input: Consider Input: Habitat destruction is a concern for all ____ gorilla subspecies.\Question: Choose the right answer from options given a) no b) four c) three d) five

Output: b


Input: Consider Input: Avian kidneys have ____ kinds of nephrons.\Question: Choose the right answer from options given a) four b) eight c) no d) two

Output: d


Input: Consider Input: Men are ____ times more likely to develop bladder cancer than women.\Question: Choose the right answer from options given a) four b) zero c) one d) ten


Output: a