This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Reproductive physiology and hormones in females, Subject name: Gynaecology & Obstetrics
Vaginal cytology for hormonal change in best taken from : 
Select and explain. 
A. Posterior wall, B. Anterior wall, C. Lateral wall, D. Any wall
C: Lateral wall
Answer: C: Lateral wall 
Explanation: Cytohormonal evaluation The ovarian hormones estrogen and progesterone influence the vaginal mucosa The epithelial cells shed in vaginal mucosa reflect the influence of prevailing dominant hormone at that time Smears are best taken from lateral walls Estrogen dominated smears: Clean, discrete cornified polygonal squamous cells Progesterone dominated: Diy, predominant intermediate cells Pregnancy: Intermediate and Navicular cells Menopause: Parabasal and Basal cells Reference: Shaw's Textbook of Gynecology; 16th edition; Page no: 84