Which compounds may be found in blood due to fire exposure?

The correct choice highlights the presence of compounds such as hydrogen cyanide and hydrogen chloride in blood after fire exposure. When organic materials burn, especially those containing nitrogen and chlorine, they can generate these hazardous gases. Hydrogen cyanide, a product of combustion from materials like plastics and synthetic fibers, is particularly significant because it's highly toxic and can be absorbed into the bloodstream through inhalation. Similarly, hydrogen chloride, produced by burning materials containing chlorine (like PVC), can also enter the system and affect blood chemistry.

In the context of fire exposure, monitoring for these compounds in blood samples can provide critical insights into the exposure levels of victims and help investigators understand the conditions surrounding the incident, making them essential for thorough fire investigations.