Given a scientific passage and an answer, generate a question for the given answer.

[Q]: Passage: Cloud types include cirrus, stratus, and cumulus. Answer: clouds
[A]: Cirrus, stratus, and cumulus are types of what?

[Q]: Passage: The composition of the magma determines if the rock is mafic, felsic, or intermediate. Answer: intermediate
[A]: The composition of the magma determines if the rock is mafic, felsic, or what?

[Q]: Passage: Health care has been improving over the most recent centuries. Vaccines were developed that could prevent many diseases ( Figure below ). Antibiotics were discovered that could cure most infections caused by bacteria. Together, these two advances saved countless lives. Answer: bacteria
[A]:
Antibiotics can cure most infections that are caused by what?