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: Whales are divided into ____ categories, based on their teeth.\Question: Choose the right answer from options given a) two b) four c) nine d) ten
Example Output: a

Example Input: Chickens take about six to ____ weeks to grow.\Question: Choose the right answer from options given a) eight b) two c) no d) five
Example Output: a

Example Input: White chocolate is a confection of fat and sugar and contains ____ antioxidants at all.\Question: Choose the right answer from options given a) nine b) eight c) no d) one
Example Output:
c