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': 'Chromosome 7 involvement is seen in: \nSelect and explain. \nA. Osteosarcoma, B. Osteosarcoma, C. Cystic fibrosis, D. Colon Ca', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Cystic fibrosis', 'role': 'assistant'}]