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').

Input: Consider 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

Output: a

Input: Consider Input: Cleavage occurs typically in either one, two, three, four, or ____ directions.\Question: Choose the right answer from options given a) six b) three c) ten d) two

Output: a

Input: Consider Input: Salmonids use ____ forms of cover, overhead and submerged.\Question: Choose the right answer from options given a) two b) zero c) no d) five
Output: a