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: Female cats have ____ X's in each cell.\Question: Choose the right answer from options given a) five b) two c) one d) ten
Example Output: b

Example Input: Firebrat eggs hatch in about ____ weeks.\Question: Choose the right answer from options given a) ten b) one c) two d) no
Example Output: c

Example Input: Child mortality includes deaths within the first ____ years after birth.\Question: Choose the right answer from options given a) zero b) four c) five d) one
Example Output:
c