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').

Ex 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

Ex Output:
a


Ex Input:
Real airplanes have round engines and ____ wings.\Question: Choose the right answer from options given a) four b) six c) three d) two

Ex Output:
d


Ex Input:
Magnets are polarized, meaning every magnet has ____ opposite ends.\Question: Choose the right answer from options given a) five b) seven c) two d) eight

Ex Output:

c