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: Alleles fall into ____ classes based on somatic, gonadal and dauer phenotypes.\Question: Choose the right answer from options given a) ten b) six c) eight d) no

Output: b


Input: Consider Input: Pandas reach adulthood at about ____ years of age.\Question: Choose the right answer from options given a) eight b) seven c) five d) six

Output: c


Input: Consider Input: Young chuckwallas have four or five broad bands across the body, and three or ____ on the tail.\Question: Choose the right answer from options given a) four b) five c) three d) two


Output: a