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
The primary site of multiplication of rickettsial organisms is in the - 
Select and explain. 
A. Parenchymal cells of the liver, B. Endothelial cells of small vessels, C. Media of arteries, D. Adventitia of all blood vessels
B: Endothelial cells of small vessels
Answer: B: Endothelial cells of small vessels 
Explanation: None