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: Bulls can stand as tall as ____ feet at the shoulders.\Question: Choose the right answer from options given a) one b) five c) seven d) four

Output: b


Input: Consider Input: Some people have ____ symptoms until the liver has been quite severely damaged.\Question: Choose the right answer from options given a) eight b) no c) nine d) ten

Output: b


Input: Consider Input: Induction also operates early in development, even before the ____ layered embryo forms.\Question: Choose the right answer from options given a) zero b) two c) ten d) three


Output: d