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:
Righteousness always points in ____ directions.\Question: Choose the right answer from options given a) six b) two c) one d) four

Ex Output:
b


Ex Input:
Nymphs feed and mature through ____ instars in about six to eight weeks.\Question: Choose the right answer from options given a) four b) eight c) five d) no

Ex Output:
c


Ex Input:
Many doctors recommend waiting five to ____ weeks before resuming sexual intercourse.\Question: Choose the right answer from options given a) five b) six c) no d) nine

Ex Output:

b