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:
Japan is a highly urbanised country, with approximately ____ in every four people living in cities.\Question: Choose the right answer from options given a) ten b) no c) five d) three

Ex Output:
d

Ex Input:
Poisons come in ____ different forms .\Question: Choose the right answer from options given a) four b) no c) five d) ten

Ex Output:
a

Ex Input:
Unconsciousness can take place within ____ to two minutes.\Question: Choose the right answer from options given a) one b) zero c) four d) two

Ex Output:
a