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').

Example Input: Living cells have at least ____ parts.\Question: Choose the right answer from options given a) seven b) three c) zero d) four
Example Output: b

Example Input: All baleen whales have ____ blow holes.\Question: Choose the right answer from options given a) zero b) four c) seven d) two
Example Output: d

Example Input: Beer consists of ____ essential ingredients which categorizing a beverage as beer.\Question: Choose the right answer from options given a) nine b) ten c) eight d) four
Example Output:
d