It is about the quest 
Bat fur and Beetle legs in Paineel.
If you turn in one 
Bat Fur or one 
Fire Beetle Leg (or everything at once) 
Dzan Amo says, '
I need no fewer than four infected rat livers!! Now, go get me what I require!!'. That in fact is the answer for the turn ins for 
Sern Adolia and his 
Cazic Thule Symbol Quests and is obviously wrong here.
Allakhazam shows the same error. 
[You must be logged in to view images. Log in or Register.] I have no idea what the correct answer should be.