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').

Input: Consider Input: Astronauts sleep only ____ hours each night, on average.\Question: Choose the right answer from options given a) six b) one c) four d) seven

Output: a


Input: Consider Input: Psychiatrists say that one in ____ people are mentally ill.\Question: Choose the right answer from options given a) one b) two c) four d) nine

Output: c


Input: Consider Input: Roman dodecahedrons feature in ____ lemmas.\Question: Choose the right answer from options given a) ten b) four c) one d) two


Output: d