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:
Most infected persons have ____ symptoms of disease.\Question: Choose the right answer from options given a) six b) no c) three d) one

Ex Output:
b


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:
Distance Refers to the relative positions of ____ opposing fencers.\Question: Choose the right answer from options given a) three b) zero c) two d) six

Ex Output:

c