Instructions: Given a scientific passage and an answer, generate a question for the given answer.
Input: Passage: Different pathogens spread in different ways. Some pathogens spread through food. They cause food borne illnesses, which are discussed in a previous concept. Some pathogens spread through water. Giardia lamblia is one example. Water can be boiled to kill Giardia and most other pathogens. Answer: pathogens
Output:
Water can be boiled to kill giardia and most other what?