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
[{'content': 'Vaginal cytology for hormonal change are best taken from : \nSelect and explain. \nA. Posterior wall, B. Anterior wall, C. Lateral wall, D. Any wall', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Lateral wall', 'role': 'assistant'}]