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:
Human malaria is caused by ____ species of Plasmodium . .\Question: Choose the right answer from options given a) six b) ten c) seven d) four

Ex Output:
d


Ex Input:
Most bacteria have one or ____ circular chromosomes.\Question: Choose the right answer from options given a) ten b) eight c) six d) two

Ex Output:
d


Ex Input:
Biennials complete their life cycle in ____ growing seasons.\Question: Choose the right answer from options given a) two b) zero c) seven d) six

Ex Output:

a