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 school aged children pass at least ____ stools per week, with an average of one stool per day.\Question: Choose the right answer from options given a) three b) one c) six d) zero

Ex Output:
a


Ex Input:
Plants have at least ____ sHSP gene families which comprise a large multigene family.\Question: Choose the right answer from options given a) zero b) eight c) five d) seven

Ex Output:
c


Ex Input:
Deer ticks carry all ____ diseases.\Question: Choose the right answer from options given a) ten b) three c) no d) nine

Ex Output:

b