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: Biochemistry
Which of the following is the best technique to screen neonates for inherited metabolic disorders 
Select and explain. 
A. Tandem mass spectrometry, B. Northern Blotting, C. PCR, D. ChIP technique
A: Tandem mass spectrometry
Answer: A: Tandem mass spectrometry 
Explanation: Tandem mass spectrometry is a technique in which compounds are separated by molecular weight by one mass spectrometer, fragmented as they exit, and identified on the basis of their fragments by a second mass spectrometer.