Q: You are presented with the quiz "What can vaccines do?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "immunity results from immunization" and "immunization with vaccine is effective". So, what's the best answer to the question?

Available options: * cause euphoria. * major threat to health. * it protects them. * protect plants. * Keep someone from disease. * cause a disease. * cause a vasectomy. * rapid expansion.
The answer is:
Keep someone from disease