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: Electrolytic capacitors have a finite lifetime, usually about ____ years.\Question: Choose the right answer from options given a) zero b) ten c) four d) eight
Example Output: b

Example Input: Beer is made from fermented grains and has an alcohol content of ____ to six percent.\Question: Choose the right answer from options given a) zero b) three c) two d) ten
Example Output: b

Example Input: Cats nurse their kittens up to ____ weeks long.\Question: Choose the right answer from options given a) eight b) two c) no d) one
Example Output:
a