A Train Derailment Results in Mass Causalities

A train derailment results in mass causalities. The triage nurse is tagging patients as they arrive. Her first patient has a sucking chest wound, BP 90/50, Resp 32, and she is alert and able to respond to 11ea992e_0a8b_c9f9_9f38_fb5950442c01

A) red, Immediate threat to life
B) yellow, requiring medical attention but no threat to loss of life
C) green, ambulatory with minor injuries
D) black, not expected to survive