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

Ex Input:
What part of the body does the mycobacterium tuberculosis bacterium usually attack?

Ex Output:
lungs

Ex Input:
Harmful instances of what can result in errors in protein sequence that yield non-functional proteins?

Ex Output:
mutation

Ex Input:
Very large stars eventually become what extremely dense space regions, which are so dense that no light can escape from them?

Ex Output:
black holes