This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Forensic Medicine
When does marbling occur after death of a person? 
Select and explain. 
A. After 36 hours, B. Within 36 years, C. After 7 days, D. Within 2 hours
A: After 36 hours
Answer: A: After 36 hours 
Explanation: Marbling is due to conversion of haemoglobin into sulphmethemoglobin in blood vessels. It occurs around 36-48 hours after death.