<prompt> Brain is preserved in all of the following, except:OPC poisoningAlkaloid poisoningHeavy metal poisoningVolatile organic poisoning  <response>: Preservation of additional viscera: 1 Hea: strychnine, digitalis, yellow oleander. 2 Brain: alkaloids, OPC , opiates, CO, cyanide, strychnine, barbiturates; and volatile organic poisons. 3 Spinal cord: strychnine and gelsemium. 4 C.S.F: alcohol 5 Bile: Narcotic drugs, cocaine, methadone, glutathione, barbiturates 6 Vitreous humour: alcohol, chloroform, cocaine. 7 Lung: one lung in gaseous poisons, hydrocyanic acid, alcohol, chloroform, etc. 8 Bone: arsenic, antimony, thallium or radium. 9 Fat: 10 gm from abdominal wall or perinephric region in cases of poisoning by pesticides and insecticides. 