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:
Insects have ____ common types of metamorphosis.\Question: Choose the right answer from options given a) six b) eight c) two d) seven

Ex Output:
c


Ex Input:
Living cells have at least ____ parts.\Question: Choose the right answer from options given a) seven b) three c) zero d) four

Ex Output:
b


Ex Input:
Air governs the magick of the ____ winds, most divination.\Question: Choose the right answer from options given a) four b) ten c) three d) no

Ex Output:

a