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:
Turkish citizens can enter Bosnia and stay up to ____ months without a visa.\Question: Choose the right answer from options given a) five b) seven c) four 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:
Sexual maturity is reached at ____ years for females, and six years for males.\Question: Choose the right answer from options given a) four b) six c) zero d) one

Ex Output:

a