Given a scientific question, generate a correct answer to it.

Example Input: What part of the body does the mycobacterium tuberculosis bacterium usually attack?
Example Output: lungs

Example Input: Carbon, hydrogen, nitrogen, oxygen, phosphorus and sulfur are basic elements that form what type of compounds, which are vital to life?
Example Output: organic compounds

Example Input: What does the base of a nucleotide within dna consist of?
Example Output:
nitrogen