This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: parasitology, Subject name: Microbiology
Chromidial bars are absent in which stage of cysts in Entamoeba? 
Select and explain. 
A. Uninucleate, B. Binucleate, C. Quadra nucleate, D. Octa nucleate
C: Quadra nucleate
Answer: C: Quadra nucleate 
Explanation: In quadri nucleate stage, glycogen mass and chromidial bars are absent in cysts of Entamoeba Ref: Arora.Medical parasitology 4th ed pg. 38