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': 'Test used to differentiate between chromosomal pattern of normal cell and cancer cell? \nSelect and explain. \nA. FISH, B. PCR, C. Karyotyping, D. Comparative genomic hybridization', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]