This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Urinary Tract Infections, Subject name: Pediatrics
Most common cause of urinary tract infection in children is - 
Select and explain. 
A. EColi, B. Klebsiella sp., C. Psedomonas Aerognosa, D. Candida
A: EColi
Answer: A: EColi 
Explanation: Ans. is 'a' i.e., E Coli o Bacterial infections are the most common cause of UTI, with E coli being the most frequent pathogen, causing 75- 90% of UTIs. Other bacterial sources of UTI include the following:# Klebsiella species# Proteus species# Enterococcus species# Staphylococcus saprophyticus, especially among female adolescents and sexually active females# Streptococcus group B, especially among neonates# Pseudomonas aeruginosao Fungi (Candida species) may also cause UTIs, especially after instrumentation of the urinary tract. Adenovirus is a rare cause of UTI and may cause hemorrhagic cystitis.