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
Diagnosis of CO poisoning post mortem -a) Blood thin and red colouredb) Congestion of all organsc) Cyanosisd) Blister on skine) Parkinsonism 
Select and explain. 
A. abcd, B. bcde, C. acde, D. abde
D: abde
Answer: D: abde 
Explanation: In postmortem examination of CO poisoning, blood is thin and cherry red colored, there is congestion of internal viscera and skin blisters may occur.
Necrosis of basal ganglia (globus pallidus and putamen) may occur, as occurs in parkinsonism.
Cyanosis is not a feature of CO poisoning.