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 carcinoma cervix -a) High mitotic rateb) Bacterial contamination of the specimenc) Good metaphase activityd)  Inadequate biopsy specimen \nSelect and explain. \nA. c, B. d, C. bd, D. ac', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]