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: Gynaecology & Obstetrics
[{'content': 'With regards to acute pyelonephritis in pregnancy all of the following are true except: \nSelect and explain. \nA. Left kidney is involved in 50% of patients, B. Most common isolate is E. coli, C. More common in later 1/2 of pregnancy, D. Responds to amino glycosides', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Pyelonephritis in Pregnancy:\nEtiology:\n\nIncidence in pregnancy is 1-3%\nMore common in primigravida and young females\nUsually occurs in the second trimester after 16 weeks (>50%) but may occur in 1st and 3rd as well\nGenerally bilateral, if unilateral it is more common on right side (in more than half of the cases)\nMost common organism responsible E. coli (70%), Klebsiella (10%).\n\nComplications', 'role': 'assistant'}]