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: Pupae usually transform into adults ____ to three days later.\Question: Choose the right answer from options given a) one b) two c) no d) eight

Output: b


Input: Consider Input: Studies show that childhood obesity is epidemic and that ____ in five children is overweight.\Question: Choose the right answer from options given a) one b) two c) nine d) ten

Output: a


Input: Consider Input: Baryons consist of ____ quarks, mesons of a quark-antiquark pair.\Question: Choose the right answer from options given a) four b) three c) zero d) no


Output: b