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
Presence of maggots at post moem indicates : 
Select and explain. 
A. Duration since death, B. Cause of death, C. Mode of death, D. Posture of body at time of death
A: Duration since death
Answer: A: Duration since death 
Explanation: A i.e. Duration since death