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:
Corms are undifferentiated, uniform, and contain ____ rings when cut apart.\Question: Choose the right answer from options given a) no b) three c) one d) zero

Ex Output:
a


Ex Input:
Batteries consist of ____ electrodes immersed in an electrolyte.\Question: Choose the right answer from options given a) two b) eight c) three d) seven

Ex Output:
a


Ex Input:
Mangos are dry when they feel firm but are still leathery and show ____ pockets of moisture.\Question: Choose the right answer from options given a) five b) no c) three d) zero

Ex Output:

b