This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Adolescence, Subject name: Pediatrics
Watson Swartz Test is usually used to diagnose - 
Select and explain. 
A. Hemochromatosis, B. Acute intermittent porphyria, C. Wilson's disease, D. All of the above
B: Acute intermittent porphyria
Answer: B: Acute intermittent porphyria 
Explanation: Ans. is 'b' Acute Intermittent porphyria (Ref Taber's Dictionary, p 2154, Nelson 17/e, p 501).Watson Swartz TestIt is a test used in acute intermittent porphyria to differentiate between porphobilinogen from urobilinogen*."This test is widely used as a screening test for urinary porphobilinogen. While this test is highly sensitive it is neither specific nor quantitative and results must be confirmed with chromatography "