This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: miscellaneous, Subject name: Pathology
[{'content': 'The incidence of bilaterality in a dermoid cyst is approximately \nSelect and explain. \nA. 10%, B. 30%, C. 50%, D. 70%', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Dermoid cyst is a benign germ cell tumour (very rarely malignant 1.7% typically in women older than 40 years). They are bilateral in 10% cases, usually unilocular with smooth surface, contains hair and sebaceousmaterial, lined in pa by squamous epithelium.', 'role': 'assistant'}]