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: Physiology
Subnuclear cytoplasmic vacuolization is seen in which stage of menstural cycle ? 
Select and explain. 
A. Proliferative phase, B. During mensturation, C. Secretory phase, D. None
C: Secretory phase
Answer: C: Secretory phase 
Explanation: Ans. is 'c' i.e., Secretory phaseSubnuclear cytoplasmic vacuolization is seen in early secretory phase.Histological features in secretory phasei) Basal location of gland cell nuclei (Post-ovulation day 5-6 and later in cycle).ii) Subnuclear cytoplasmic vacuolization (early secretory phase).iii) Serated glandular configration or "Saw-tooth appearance" (mid-secretory phase).iv) Periaeriolar predecidual rection (mid-secretory phase).