Kanagawa phenomenon on wagatsuma agar is shown by
**Core Concept**
The Kanagawa phenomenon is a biochemical reaction that occurs when certain strains of Staphylococcus aureus produce thermonuclease, an enzyme that breaks down the thermostable alpha-naphthyl acetate esterase substrate on Wagatsuma agar. This reaction is used as a diagnostic tool to identify S. aureus.
**Why the Correct Answer is Right**
The correct answer involves the production of thermonuclease, an enzyme encoded by the nuc gene in S. aureus. The enzyme breaks down the Wagatsuma agar substrate, resulting in a characteristic color change. This reaction is specific to S. aureus and is used in clinical microbiology to differentiate it from other bacterial species. The thermonuclease activity is a key virulence factor for S. aureus, allowing it to colonize and infect host tissues.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not relate to the Kanagawa phenomenon or thermonuclease production.
**Option B:** This option is incorrect because it is not a relevant biochemical reaction associated with S. aureus.
**Option C:** This option is incorrect because it is not a characteristic of S. aureus or the Kanagawa phenomenon.
**Clinical Pearl / High-Yield Fact**
The Kanagawa phenomenon is a classic example of a biochemical reaction used in clinical microbiology to identify a specific bacterial species. It highlights the importance of enzyme production in bacterial pathogenesis and the need for accurate diagnostic techniques in clinical practice.
**Correct Answer:** C. Staphylococcus aureus