A nurse is teaching a client about carbon monoxide poisoning. Which of the following statements should the nurse identify as an indication that the client needs further instruction?

The correct answer is D. Carbon monoxide is odorless, colorless, and tasteless, so it cannot be detected by a metallic odor. This is a common misconception that needs to be corrected. A: True, high concentrations can be fatal. B: Correct, a detector is essential for safety. C: True, common symptoms of CO poisoning. In summary, D is incorrect because carbon monoxide does not have a metallic odor, unlike the other options which are all accurate statements regarding carbon monoxide poisoning.