solution: Of the two-digit perfect squares, only $4^2=16$ and $6^2=36$ end in $6$. Thus, there are $\boxed{2}$ distinct possible values for $B$.
prompt.content: <|im_start|>system
  You are a helpful assistant.<|im_end|>
  <|im_start|>user
  The two-digit number $``B6,''$ where $B$ is the tens digit, is the square of a positive integer. How many distinct possible values are there for $B$?
  Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
  <|im_start|>assistant
  
prompt.role: user
extra_info.answer: 2
extra_info.question: The two-digit number $``B6,''$ where $B$ is the tens digit, is the square of a positive integer. How many distinct possible values are there for $B$?
extra_info.split: test