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: Social & Preventive Medicine
The type of trasmission involved in the case of plague in rat flea - 
Select and explain. 
A. Propagative, B. Cyclo propagative, C. Cyclo- Developmental, D. None
A: Propagative
Answer: A: Propagative 
Explanation: None