<prompt> Fat mesentry is sent for investigation in which poisoning-Carbon monoxideOrganophosphorousArsenicLead  <response>: Ans. is b i.e., Organophosphorous For organophosphorous pesticidesinsecticides poisoning fatty tissue from abdominal wall, perinephric fat and brain are preserved. The viscera should be preserved in cases of suspected poisoning and must be send for toxicological examination. The viscera are preserved according to suspected poison : Brain 100 gm of cerebrum or cerebellun : Carbon monoxide, cyanide, organophosphates, organic volatile poisons, opiates, barbiturates, alkaloids, strychnine nux vomica. Spinal cord entire length : Strychnine. Hea : Strychnine, digitalis. Lung one : Gaseous poison e.g. CO, alcohol, chloroform, cyanide. Bone 10 cm shaft femur : Subacute and chronic poisoning by heavy metals, e.g. arsenic, antimony, radium, thallium. Hair 20-30 in number or 5 gm and nails all finger and toe : Subacute and chronic poisoing by heavy metals, e.g. arsenic, antimony, radium, thallium. Uterus, its appendages and upper pa of vagina : Criminal aboion. Fat 10 gm from abdomen or perinephric region : Pesticides and insectisides. Vitreous humor : Alcohol, chloroform. Bile : Glutathione, cocaine, barbiturates, methadone, narcotics. Skin : Injection of insulin, morphin, heroin, cocain etc. Urine : Alcohol, barbiturate and opium. 