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: Pathology
[{'content': 'Conventional cytogenetics are difficult in solid tumors ,especially in case of Ca Cx due to: \nSelect and explain. \nA. High mitotic rate, B. Bacterial contamination of the specimen, C. Good metaphase activity, D. Inadequate biopsy specimen', 'role': 'user'}, {'content': 'Answer: D \nExplanation: . Inadequate biopsy specimen', 'role': 'assistant'}]