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: Medicine
Most common agent causing catheter induced urinary tract infection is: 
Select and explain. 
A. E.Coli, B. Pseudomonas, C. Staphylococcus epidermidis, D. Proteus
A: E.Coli
Answer: A: E.Coli 
Explanation: Answer is A (E.Coli): Associate Urinary Tract Infection (CAUTI) is E.Coli. The most common etiological agent for acute uncomplicated cystitis is E.Coli The most common etiological agent for uncomplicated pyelonephritis is E. Coli The most common etiological agent for Complicated UT1 (e.g. CAUT1) is E.Coli