Given the task definition and input, reply with output. Given a scientific passage and an answer, generate a question for the given answer.

Passage: Inorganic chemistry is the study of chemicals that do not, in general, contain carbon. Inorganic chemicals are commonly found in rocks and minerals. One current important area of inorganic chemistry deals with the design and properties of materials involved in energy and information technology. Answer: carbon
Inorganic chemistry refers to the study of materials *not* containing which element?