Confirmatory tests for Corynebacterium diphtheriae is
**Core Concept**
The diagnosis of *Corynebacterium diphtheriae* infection involves both preliminary and confirmatory tests. Confirmatory tests are essential for definitive diagnosis due to the potential severity of diphtheria.
**Why the Correct Answer is Right**
Although the specific correct answer is not provided, typically, confirmatory tests for *Corynebacterium diphtheriae* include microbiological tests such as isolation of the organism on selective media like tellurite agar, followed by biochemical identification, and toxin detection assays.
**Why Each Wrong Option is Incorrect**
**Option A:** Without knowing the specifics, generally, any option not involving microbiological or toxin detection methods would be incorrect.
**Option B:** Similarly, an option not focused on direct detection or identification of *Corynebacterium diphtheriae* or its toxin would be incorrect.
**Option C:** An option that does not involve a direct test for the bacteria or its components would likely be incorrect.
**Option D:** Assuming this is not the correct microbiological or toxin detection method, it would be incorrect.
**Clinical Pearl / High-Yield Fact**
A key point in diagnosing diphtheria is the prompt identification of *Corynebacterium diphtheriae* to initiate appropriate antibiotic therapy and prevent further toxin production.
**Correct Answer:** Correct Answer: D. Elek’s test