This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Death and postmortem changes, Subject name: Forensic Medicine
Which of the following is not a cause of "obscure autopsy"? 
Select and explain. 
A. Epilepsy, B. Reflex Vagal Inhibition, C. Cardiac Tamponade, D. Anaphylaxis
C: Cardiac Tamponade
Answer: C: Cardiac Tamponade 
Explanation: OBSCURE AUTOPSY: An autopsy done meticulously, properly and perfectly, but may present with no clear-cut findings as to give a definite cause of death, leading to the perplexity of the forensic pathologist is defined as an obscure autopsy Ref - Krishnan Vij 5th edition pg 29