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 cause of acute UTI: 
Select and explain. 
A. E.coli, B. Klebsiella, C. Strep. faecalis, D. Staph. saprophyticus
A: E.coli
Answer: A: E.coli 
Explanation: → Acute uncomplicated UTI:-  

Escherichia coli– cause about 80% of UTI. 

 
→ 20% UTI caused by:- 

Gram negative enteric bacilli – Klebsiella proteus. 
Gram positive cocci – Streptococcus faecalis. 
Staphylococcus saprophyticus - restricted to infection in young sexually active women.