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:
Photosynthesis occurs in ____ phases.\Question: Choose the right answer from options given a) four b) two c) nine d) five

Ex Output:
b


Ex Input:
Elastic collisions are collisions in which there is ____ loss of kinetic energy.\Question: Choose the right answer from options given a) zero b) six c) one d) no

Ex Output:

d