<prompt> Tenany is caused by which poisoning -Oxalic acidCarbolic acidSulphuric acidNitric acid  <response>: Oxalic Acid Synonyms: Salts of Sorrel, Acid of Sugar Mechanism of Action Local: It acts as corrosive when used in concentrated form and act as irritants when used in dilute form Systemic: After absorption, oxalic acid combines with calcium ion and causes hypocalcemia. It also causes tubular necrosis and renal failure. Clinical Features Local: Corrosion of mucosa with underlying congestion. The corroded area is referred as scalded in appearance. Systemic Vomiting and diarrhea Hypocalcemia tetany Muscle irritability, tenderness, cramps Convulsions Accouchers hand due to carpopedal spasm Chavosteks sign positive. When tapping is done over facial nerve area, there is spasm of facial muscles. Metabolic acidosis Renal failure Uremia. Management Local exposure: Wash the affected skin with copious water Gastric lavage with calcium gluconate or calcium lactate Calcium gluconate intravenously Symptomatic. Autopsy Findings Scalded mucosa of GIT Mucous membrane of mouth, tongue, pharynx, esophagus may be bleached and has scalded appearance Kidneys show edema, congestion with oxalate crystals in renal tubules with necrosis of proximal convoluted tubule. Medicolegal Impoance 1. Accidental poisoning - common 2. Suicidal ingestion - rare 3. Homicide - not possible. REF;THE SYNOPSIS OF FORENSIC MEDICINE:KS NARAYANA REDDY;28th EDITION;PAGE NO299 