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').
--------
Question: Poisons come in ____ different forms .\Question: Choose the right answer from options given a) four b) no c) five d) ten

Answer: a


Question: Copper is ____ times higher in dog liver than in human liver.\Question: Choose the right answer from options given a) three b) ten c) six d) one

Answer: b


Question: Toucans live in small flocks of ____ or six birds.\Question: Choose the right answer from options given a) five b) four c) three d) two

Answer:
a