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: 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
Example Output: c

Example Input: Moles breed in late winter or spring and have a gestation period of ____ to six weeks.\Question: Choose the right answer from options given a) nine b) four c) six d) five
Example Output: b

Example Input: Children burn to death and leave ____ traces of themselves.\Question: Choose the right answer from options given a) nine b) four c) no d) zero
Example Output:
c