This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Microbiology
All are seen in cyst of E.Histolytica except ? 
Select and explain. 
A. Glycogen mass, B. Chromatid bars, C. Eccentric nucleus, D. Refractile nucleus
D: Refractile nucleus
Answer: D: Refractile nucleus 
Explanation: Ans. is 'd' i.e., Refractile nucleus . The early cyst contains a single nucleus and two other structures - a mass of glycogen and one to four chromatid bodies.