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:
Material culture is the realm of ____ dimensional objects that make up our everyday environment.\Question: Choose the right answer from options given a) ten b) three c) six d) four

Ex Output:
b

Ex Input:
Lameness can range from the barely perceptible to a horse hobbling along on ____ legs.\Question: Choose the right answer from options given a) four b) six c) ten d) three

Ex Output:
d