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:
Kabbalists group the simple letters into ____ triplets.\Question: Choose the right answer from options given a) four b) no c) ten d) three

Ex Output:
a


Ex Input:
Female cats have ____ X's in each cell.\Question: Choose the right answer from options given a) five b) two c) one d) ten

Ex Output:
b


Ex Input:
Physical science is divided into ____ main branches.\Question: Choose the right answer from options given a) one b) two c) no d) eight

Ex Output:

b