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
In phenylketonuria FeC13 test with urine gives ...............color- 
Select and explain. 
A. Green, B. Blue, C. Red, D. Purple
A: Green
Answer: A: Green 
Explanation: Ans. is 'a' i.e., GreenDiagnosis o Elevated phenylalanine levelso Elevated blood tyrosine levelo Presence of urinary metabolites of phenylalanineo Guthrie's Test It detects the presence of phenylalanine in serumo FeCI, --> It detects the presence of phenylalanine in urine. FeCl3 is added to patients urine. If it contains phenylalanine, it will turn green.o 2-4 Dinitrophenol hydrazine --> gives yellow precipitate with old urine.