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: Selenium is ____ times more poisonous than arsenic.\Question: Choose the right answer from options given a) one b) five c) eight d) two

Output: b


Input: Consider Input: Respiratory therapists complete ____ to four years of education.\Question: Choose the right answer from options given a) one b) nine c) zero d) two

Output: d


Input: Consider Input: Orangutans have ____ serious predators except humans.\Question: Choose the right answer from options given a) no b) four c) three d) two


Output: a