This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: JIPMER 2017, Subject name: Microbiology
Ingested RBCs (Erythrophagy) seen in: 
Select and explain. 
A. Naegleria fowleri, B. Entamoeba histolytica, C. Entamoeba coli, D. Acanthamoeba
B: Entamoeba histolytica
Answer: B: Entamoeba histolytica 
Explanation: Erythrophagocytosis (engulfed RBC inside trophozoites) is confirmatory of E. histolytica.Infective form of E. histolytica- Quadrinucleate cyst.