Class A Fires consist of ordinary combustibles such as wood, paper, trash or anything else that leaves an ash. Water works best to extinguish a Class A fire. Class B Fires are fueled by flammable or combustible liquids, which include oil, gasoline, and other similar materials.
The amygdala is involved in our experience of emotion and in tying emotional meaning to our memories. The hypothalamus regulates a number of homeostatic processes, including the regulation of body temperature, appetite, and blood pressure.
1 Odor-evoked autobiographical memory describes the vivid emotional memories often triggered by various scents.  Odors are especially effective as reminders of past experience, much more so than cues from other senses, such as sights or sounds.