<prompt> Caustic poison erodes mucosa becauseGlue like actionHygroscopic in natureHigh affinity for mucosaBeing programmed to stick  <response>: B i.e. Hygroscopic in nature Caustic alkalis are the commonest cause of chemical burns. The hydroxyl ion produces a saponification of fat, soluble alkaline proteinases, cellular dehydration hygroscopic excrating water from tissuesQ, exothermic reaction, coagulation of cellular proteins and conversion of hemoglobin into haematin. Mainly in the local tissues of alimentary tract or rarely respiratory mucosa. 