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': 'Cystic fibrosis affects all systems EXCEPT: \nSelect and explain. \nA. Respiratory, B. Endocrine, C. Hepatobiliary, D. Genitourinary', 'role': 'user'}, {'content': "Answer: B \nExplanation: ANSWER: (B) EndocrineREF: Harrison's Internal Medicine, Chapter 253, Davidson's internal medicine 20tSl edition page- 685FEATURES OF CYSTIC FIBROSIS:A- Autosomal recessiveB- BronchiectasisC- Chloride channel block/Ciliary dysfunctionD- Diabetes mellitusE- Exocrine pancreatic failure (>90% of patients with CF)F- Fat malabsorption (steatorrhoea)G- Gall stone/Gene mutation on chromosome 7H- Hepatic cirrhosis/HemoptysisI- Intestinal obstruction/Infertility", 'role': 'assistant'}]