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:
Sugar beet is strongly self-sterile setting few or ____ seeds under strict isolation.\Question: Choose the right answer from options given a) three b) no c) five d) nine

Ex Output:
b


Ex Input:
Unequal cleavage can occur in ____ ways.\Question: Choose the right answer from options given a) two b) seven c) three d) ten

Ex Output:
a


Ex Input:
Solutions are homogeneous mixtures of ____ or more pure substances.\Question: Choose the right answer from options given a) two b) eight c) zero d) no

Ex Output:

a