This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Disorders of Amino acid Metabolism, Subject name: Pediatrics
[{'content': 'Blood spot Tandem mass spectrometry can be used in the diagnosis of all the following disorders EXCEPT? \nSelect and explain. \nA. Lesch Nyhan disease, B. Fatty acid oxidation defects, C. Mitochondrial disorders, D. Propionic Acidemia', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Tandem mass spectrometry used in the diagnosis of: Fatty acid oxidation defects Mitochondrial defects Organic acidemias Aminoacidopathies Urea cycle disorders.', 'role': 'assistant'}]