Definition: Given a scientific passage and an answer, generate a question for the given answer.
Input: Passage: In some amines, the nitrogen atom replaces a carbon atom in an aromatic hydrocarbon. Pyridine (Figure 20.17) is one such heterocyclic amine. A heterocyclic compound contains atoms of two or more different elements in its ring structure. Answer: heterocyclic
Output:
What type of compound contains atoms of two or more different elements in its ring structure?