I think it makes more sense to set query equal to the user input in the runner, and then pass in that value to this method. example:

*in runner.rb*
```ruby
  query = gets.chomp
  if ValidationAndQuery::validate query
    ...
  else
    puts "wrong input"
```  

*in this file*

```ruby
def validate query
  ...
  if currency_options.include? query
    true
  else
    false
  end
end
```