This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Misc., Subject name: Microbiology
In Japanese Encephalitis pigs acts as: 
Select and explain. 
A. Amplifier, B. Definitive host, C. intermediate host, D. Any of the above
A: Amplifier
Answer: A: Amplifier 
Explanation: (A)' Amplifier # In Japanese encephalitis, pig acts an amplifier, it doesn't manifest the disease.> Herons acts as reservoir hosts.> Human infection is a tangential 'dead end' event> Vertebrate hosts may include cattle and buffalo besides pig.