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: Reality is more than what can be perceived with the ____ senses.\Question: Choose the right answer from options given a) five b) four c) ten d) one
Example Output: a

Example Input: Nightmares happen frequently in childhood, especially between the ages of ____ and six.\Question: Choose the right answer from options given a) three b) eight c) no d) ten
Example Output: a

Example Input: Some people have ____ or four careers during their lives.\Question: Choose the right answer from options given a) three b) ten c) four d) one
Example Output:
a