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: Blood pressure is measured by ____ numbers.\Question: Choose the right answer from options given a) zero b) eight c) two d) seven

Output: c


Input: Consider Input: Perennial grass takes three to ____ years before it is mature enough to produce adequate seed.\Question: Choose the right answer from options given a) five b) seven c) six d) four

Output: a


Input: Consider Input: Disc florets are usually actinomorphic, with ____ petal lips on the rim of the corolla tube.\Question: Choose the right answer from options given a) six b) five c) seven d) two


Output: b