<prompt> Which of the following statements about Carbon Monoxide poisoning is not true:Carboxy haemoglobin COHb causes left shift of oxyhaemoglobin dissociation curvePaial pressuresas low as 0.6 mm Hg can be lethalTissue toxicity plays an impoant role in clinical CO poisoningHyperbaric oxygen is used for treatment  <response>: C i.e. Tissue toxicity plays an impoant role in clinical CO poisoning 