This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Urinary Tract, Subject name: Pediatrics
Red urine without RBCs is seen in: 
Select and explain. 
A. Lupus nephritis, B. Pyelonephritis, C. Hemolytic uremic syndrome, D. Following Rifampicin ingestion
D: Following Rifampicin ingestion
Answer: D: Following Rifampicin ingestion 
Explanation: Ans. D. Following Rifampicin ingestionHematuria is defined as the presence of 5 or more red blood cells (RBCs) per high-power field in 3 of 3 consecutive centrifuged specimens obtained at least 1 week apart. Hematuria can be either gross (i.e., overtly bloody, smoky, or tea- colored urine) or microscopic. However ingestion of certain drugs like Rifampicin and Pyridium may impart red colour to urine which may be mistaken for hematuria. Uric acid crystals may also impart a pink tinge to the nappy.