Signs and symptoms of a life-threatening emergency due to asthma include all of the following EXCEPT:

What is a backdraft?

A) A rapidly occurring transitional event in the development of a compartment fire B) The condition whereby unburned fuel (pyrolyzate) from the originating fire has accumulated in the ceiling layer to a sufficient concentration that it ignites and burns C) The ignition of unburned pyrolyzates due to sudden influx of air which ignites and results in an extremely rapid burning of gases/pyrolysis products being forced out through an opening D) The sudden ignition of a diffused fuel suspended in the atmosphere

Which oxygen tank attachment allows pressure to be released at a reduced rate?

a. regulator b. flowmeter c. oxygen mask d. adapter