This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Misc., Subject name: Forensic Medicine
All of the following are preserved in a case of poisoning except 
Select and explain. 
A. Stomach with its contents, B. A loop of large intestine, C. Blood, D. Urine
B: A loop of large intestine
Answer: B: A loop of large intestine 
Explanation: (B) A loop of large Intestine