This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Postmoem techniques, Subject name: Forensic Medicine
Body cavity which is opened first on post moem examination 
Select and explain. 
A. Head, B. Neck, C. Thorax, D. abdomen
C: Thorax
Answer: C: Thorax 
Explanation: Routinely thorax is the first cavity most commonly opened on PM examination. In aspyxial deaths, dissection of the head is recommended prior to body because a bloodless field . In case of poisoning: After the opening of the skull we may immediately smell the presence of volatile, poisonous substances (e.g., ethanol, cyanide, solvents, etc.) without competing odours from thoracic and abdominal cavity