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: Snowflakes are crystals that have many different shapes, but each snowflake has ____ points on it.\Question: Choose the right answer from options given a) six b) nine c) one d) seven
Example Output: a

Example Input: Today there are ____ UK hospitals doing heart transplants.\Question: Choose the right answer from options given a) three b) five c) six d) nine
Example Output: d

Example Input: Newborns routinely cry a total of one to ____ hours per day.\Question: Choose the right answer from options given a) five b) one c) four d) six
Example Output:
c