This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Genetic and genetic disorders, Subject name: Pediatrics
10 year old with poor growth, poor appetite, recurrent chest infections and steatorrhea is likely to have 
Select and explain. 
A. High sodium and chloride in sweat, B. Diabetes mellitus, C. Recurrent skin allergy, D. Mental retardation
A: High sodium and chloride in sweat
Answer: A: High sodium and chloride in sweat 
Explanation: The above given case suggestive that child with High sodium and chloride in sweat. Reference: GHAI Essential pediatrics, 8th edition