Some NBME 16 doubts

I've gone through my wrong qs. Still a few that I don't quite get it. I post few here 3-35) 27yo woman nulligravid with 24-hr hx of pain with urination and increased urinary frequency. Sexually active with 1 partner and takes oral contraceptive, no condoms. T 37C. Suprapubic tenderness. Cause? (A) Candida albicans (B) E. Coli (C) HPV (D)Neisseria gonorrheae (E)Treponema pallidum I picked Neisseria and wrong. I know that E. Coli is the most common cause of UTI, but doesn't her unprotected... Some NBME 16 doubts
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