This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Infections of the genital tract, Subject name: Gynaecology & Obstetrics
Which of the following cannot be detected by wet film ? 
Select and explain. 
A. Candida, B. Trichomonas, C. Chlamydia, D. Bacterial vaginosis
C: Chlamydia
Answer: C: Chlamydia 
Explanation: Diagnosis of chlamydial infections nucleic acid amplification by PCR Chlamydial Antigenby ELISA Tissue cultures D.C.DUTTA'S TEXTBOOK OF GYNAECOLOGY,Pg no:150,6th edition