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: Oranges signify good health, and the number ____ sounds like the word for prosperity.\Question: Choose the right answer from options given a) eight b) ten c) seven d) five
Example Output: a

Example Input: Chimeras are ____ headed creatures that shoot fire from all three heads, damaging a wide area.\Question: Choose the right answer from options given a) three b) one c) eight d) six
Example Output: a

Example Input: Regeneration contains ____ types of fiber to maintain intestinal integrity.\Question: Choose the right answer from options given a) two b) five c) three d) seven
Example Output:
c