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
If a body is left undisturbed, for how long does post mortem staining persists - 
Select and explain. 
A. Few hours, B. Few days, C. Few month, D. Persists till merges with discolouration of putrefaction
D: Persists till merges with discolouration of putrefaction
Answer: D: Persists till merges with discolouration of putrefaction 
Explanation: None