This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pediatrics
Cutoff value of sweat chloride values above which 2 consistantly higher reading is diagnostic for Cystic fibrosis is 
Select and explain. 
A. 40 mEq / L, B. 50 mEq / L, C. 60 mEq / L, D. 70 mEq / L
C: 60 mEq / L
Answer: C: 60 mEq / L 
Explanation: One or more clinical features of Cystic Fibrosis
+
Two consistently > 60 mEq / L Sweat chloride
values is diagnostic of Cystic fibrosis.