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: Gynaecology & Obstetrics
'Clue cells' are seen in: 
Select and explain. 
A. Bacterial vaginosis, B. Vaginal Candidiasis, C. Chlamydial vaginosis, D. Trichomoniasis
A: Bacterial vaginosis
Answer: A: Bacterial vaginosis 
Explanation: Clue cells are epethelial cells covered with bacteria and are identified on microscopy. They are characteristic of Bacterial Vaginosis. Ref: Clinical Obstetrics and Gynaecology by Brian A. Magowan, Philip Owen, James Drife, Pages 125-134.