<prompt> Please answer with one of the option in the bracket. Write reasoning in between . Write answer in between .Q:A 33-year-old woman is brought to the emergency department 30 minutes after being rescued from a fire in her apartment. She reports nausea, headache, and dizziness. Physical examination shows black discoloration of her oral mucosa. Pulse oximetry shows an oxygen saturation of 99 on room air. The substance most likely causing symptoms in this patient primarily produces toxicity by which of the following mechanisms?? A: Competitive binding to heme, B: Rise in serum pH, C: Oxidation of Fe2, D: Degradation of 2,3-bisphosphoglycerate, E: Inhibition of mitochondrial complex V,  <response>: This is a medical question asking about the mechanism of toxicity for a substance causing symptoms in a patient after smoke inhalation. The patient has nausea, headache, dizziness and black discoloration of the oral mucosa after being rescued from a fire. The key details are smoke inhalation and black discoloration of the oral mucosa. This indicates the patient likely inhaled carbon monoxide from the fire. Carbon monoxide toxicity is caused by competitive binding to heme proteins like hemoglobin.A: Competitive binding to heme 