Ans: A. Blisters are present(Ref Parikh 6/e p4.168) Vesicles & blisters are usually absent in chemical burns.Chemical burn:Occurs when living tissue is exposed to a corrosive substance such as a strong acid or base.Follows standard burn classification.Cause extensive tissue damage.Main types of irritant and/or corrosive products are:Acids, bases, oxidizersreducing agents, solvents, and alkylants.Chemical weapons, e.g. vesicants such as mustard gas and lewisite, or uicants such as phosgene oxime.