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: Vision disorders affect ____ in every four school-age children.\Question: Choose the right answer from options given a) nine b) one c) five d) six
Example Output: b

Example Input: Tardigrades are microscopic, water-dwelling, segmented animals with ____ legs.\Question: Choose the right answer from options given a) eight b) nine c) one d) seven
Example Output: a

Example Input: Anoles are ____ strangers to urban environments.\Question: Choose the right answer from options given a) seven b) zero c) six d) no
Example Output:
d