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

Input: Consider Input: Passage: boundary between air masses that is stalled in one place. Answer: aids

Output: Opportunistic diseases are usually the direct cause of death of people with what disease?

Input: Consider Input: Passage: Not all wetlands are alike, as you can see from Figure below . Wetlands vary in how wet they are and how much of the year they are soaked. Wetlands also vary in the kinds of plants that live in them. This depends mostly on the climate where the wetland is found. Types of wetlands include marshes, swamps, and bogs. Answer: wetlands

Output: Marshes, swamps, and bogs are types of what?

Input: Consider Input: Passage: 15.11 Amines: Structures and Names LEARNING OBJECTIVES Identify the general structure for an amine. Identify the functional group for amines. Determine the structural feature that classifies amines as primary, secondary, or tertiary. Use nomenclature systems to name amines. Amines are classified according to the number of carbon atoms bonded directly to the nitrogen atom. A primary (1) amine has one alkyl (or aryl) group on the nitrogen atom, a secondary (2) amine has two, and a tertiary (3) amine has three (http://catalog. flatworldknowledge. com/bookhub/reader/2547. Answer: nitrogen
Output: Amines are classified according to the number of carbon atoms bonded directly to what atom?