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
10-year old male with poor growth, poor appetite, recurrent chest infection and steatorrhea is likely to have ____________ . 
Select and explain. 
A. High sodium and chloride levels in the sweat, B. Diabates mellitus, C. Recurrent skin allergy, D. Mental retardiation
A: High sodium and chloride levels in the sweat
Answer: A: High sodium and chloride levels in the sweat 
Explanation: Cystic fibrosis features : GIT:chronic diarrhoes,steatorrhoea,pain abdomen,malabsorption,constipation,meconium ileus hepato biliary:fatty liver,jaundice,poal hypeension,hepatic failure,gall stones pancreatic:recurrent pancreatitis,dysfunction nutritional defeciency:vit defeciency,micronutient defeciency,failure to thrive recurrent and persistant pneumonia Analysis for sweat chlorides is a reliable diagnostic test.level of chlorides above 60 mEq/lis suggestive of cystic fibrosis Reference: GHAI Essential pediatrics, 8th edition