This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory system, Subject name: Pediatrics
Features of cystic fibrosis 
Select and explain. 
A. Lung normal at bih, B. Low sweat choride tests, C. Autosomal dominant, D. Defect in Chromosome 11
A: Lung normal at bih
Answer: A: Lung normal at bih 
Explanation: The sweat chloride is high(>60 mEq/L) Defect in long arm of chromosome 7 Autosomal recessive condition. Ref : Essential pediatrics,O.P.Ghai,7 th edition,pg no:369