A 27-year-old man presents with haematuria and dysuria. He is sexually active with multiple partners and does not use condoms consistently. What is the most appropriate initial investigation for suspected urethral chlamydial infection?AFirst-catch urine nucleic acid amplification test (NAAT) for chlamydia and gonorrhoeaBMidstream urine for microscopy, culture and sensitivity onlyCSerum chlamydia IgG antibodiesDUrethral swab for Gram stain onlyECystoscopyCheck my answer