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: Pups get their sight in about ____ days.\Question: Choose the right answer from options given a) five b) six c) ten d) nine
Example Output: c

Example Input: Taste is comprised of ____ primary senses detected on the palate.\Question: Choose the right answer from options given a) two b) seven c) five d) ten
Example Output: c

Example Input: Fire blight is the most difficult to control of the ____ diseases.\Question: Choose the right answer from options given a) eight b) seven c) zero d) four
Example Output:
d