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: Microbiology
Ricketsial infections cause 30% moality due to: 
Select and explain. 
A. Endothelial injury, B. Hemodynamic instability, C. Endocarditis, D. Renal failure
A: Endothelial injury
Answer: A: Endothelial injury 
Explanation: Ans. is. 'a' i. e., Endothelial injury