Question

Disc diffusion method is also known as:

• A. Kirby Bauer
• B. VDRL
• C. Dark field microscopy
• D. None of these

Answer 1

The Correct Option is A

Step 1: Identify the technique by its mechanism - antibiotic discs diffusing into seeded agar to test bacterial susceptibility - which is eponymously the Kirby-Bauer method. Step 2: After incubation, each disc may be ringed by a zone of inhibition, and the width of that clear zone is read off to call the organism sensitive or resistant. Step 3: This is purely a sensitivity assay, so the syphilis serology choices do not apply; VDRL detects reaginic antibodies and dark field microscopy directly visualises Treponema. Step 4: Therefore the only synonym for disc diffusion among the options is Kirby Bauer. \[\boxed{\text{Kirby Bauer}}\]