On admission she is hypoxic and hypotensive

A 25-year-old female who works in a photograph development laboratory is taken to the Emergency Department due to confusion. On admission she is hypoxic and hypotensive. Cyanide poisoning is suspected following discussion with the local poisons unit. What is the definitive treatment?

Haemodialysis
Hydroxocobalamin
Penicillamine
Ferrous sulphate
Desferioxamine