This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Physiology
Which of the following statements about Carbon Monoxide poisoning is not true: 
Select and explain. 
A. Carboxy haemoglobin (COHb) causes left shift of oxyhaemoglobin dissociation curve, B. Paial pressuresas low as 0.6 mm Hg can be lethal, C. Tissue toxicity plays an impoant role in clinical CO poisoning, D. Hyperbaric oxygen is used for treatment
C: Tissue toxicity plays an impoant role in clinical CO poisoning
Answer: C: Tissue toxicity plays an impoant role in clinical CO poisoning 
Explanation: C i.e. Tissue toxicity plays an impoant role in clinical CO poisoning