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: Female bilbies have a backward-opening pouch with ____ nipples.\Question: Choose the right answer from options given a) no b) two c) five d) eight

Output: 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: Skin cancers are likely to recur within ____ years after treatment.\Question: Choose the right answer from options given a) five b) zero c) three d) no


Output: c