This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Communicable diseases, Subject name: Social & Preventive Medicine
Which is most dangerous for transmitting plague - 
Select and explain. 
A. Blocked flea, B. Paial blocked flea, C. Both, D. Unblocked flea
B: Paial blocked flea
Answer: B: Paial blocked flea 
Explanation: plaque is primarily a zoonoses caused by Yersenia pestis. -The commonest and the most efficient vector of the plaque is rat flea, Xenopsylla cheopis. - a paially blocked flea is more dangerous than a completely blocked flea due to longer life span. Reference : Park's textbook of preventive and social medicine, 23rd edition, pg no:293 <\p>