This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Genetics, Subject name: Medicine
[{'content': 'Gene mutations in Cystic fibrosis occurs at - \nSelect and explain. \nA. Sho arm of chromosome 7, B. Long arm os chromosome 5, C. Long arm of chromosome 7, D. Sho arm of chromosome .3', 'role': 'user'}, {'content': 'Answer: C \nExplanation: In cystic fibrosis, CFTR gene mutation occurs on the long arm of chromosome 7 Reference: Ghai essential pediatrics, 9 th edition, page 392', 'role': 'assistant'}]