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
Carbon monoxide poisoning is characterized by all except - 
Select and explain. 
A. Cyanosis, B. Cherry red discoloration, C. Skin blistering, D. Poison with just 10% concentration may be asymptomatic
A: Cyanosis
Answer: A: Cyanosis 
Explanation: Cyanosis is not a feature of CO poisoning.