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:
Death occurs during the first ____ days of illness without intensive care.\Question: Choose the right answer from options given a) seven b) eight c) five d) nine

Ex Output:
a


Ex Input:
Females inherit ____ X chromosomes, one from each parent.\Question: Choose the right answer from options given a) five b) two c) no d) seven

Ex Output:
b


Ex Input:
Energy supply is disaggregated into ____ categories, renewable and non-renewable.\Question: Choose the right answer from options given a) six b) five c) no d) two

Ex Output:

d