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: Medicine
SARS true are -a) Severe acute respiratory syndromeb) Documented respiratory route spreadc) Effective vaccine availabled) Cause atypical pneumonitise) Group coronavirus 
Select and explain. 
A. abde, B. bcde, C. acde, D. cde
A: abde
Answer: A: abde 
Explanation: None