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
Biochemical screening of newborn infants by heelprick blood samples is performed by using the ? 
Select and explain. 
A. Tay-Sachs Card, B. Duchenne Card, C. Guthrie Card, D. Maple Card
C: Guthrie Card
Answer: C: Guthrie Card 
Explanation: Ans. is 'c' i.e., Guthrie Card