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: Pathology
The 4 classical features of inflammation are described by - 
Select and explain. 
A. Celsus, B. Hippocrates, C. Aristotle, D. Galen
A: Celsus
Answer: A: Celsus 
Explanation: Ans. is 'a' i.e., Celsus