Task: Question Answering
Input (English): Paragraph: With a higher concentration of hydrogen ions, a solution is more acidic but has a lower pH.
 Question: Eric measures 20 hydrogen ions per 100ml in one solution. Another solution has 30 hydrogen ions per 100ml. The solution with less hydrogen ions is _____ acidic. 
 Choices: A)more 
B)less
Output (English): less