A 25 year old heterosexual male from Chandigarh came with history of dysuria and noted some pus like drainage in his underwear and at the top of his penis. He gave a history of being sexually active with five or six partners in the past 6 months. His physical examination showed yellow urethral discharge and tenderness at the tip of the penis. Gram staining of discharge showing Gram negative cocci. On the basis of Gram staining what is the probable cause of infection?

**Core Concept**
The underlying principle being tested is the identification of a sexually transmitted infection (STI) based on Gram stain results, specifically focusing on the morphology of the causative organisms. **Neisseria gonorrhoeae** is a common cause of STIs and can be identified by its Gram-negative diplococci appearance.

**Why the Correct Answer is Right**
Given the patient's symptoms of dysuria, yellow urethral discharge, and the Gram stain showing Gram-negative cocci, the most likely diagnosis is gonorrhea, caused by **Neisseria gonorrhoeae**. This bacterium is typically seen as diplococci (paired cocci) and is a common cause of urethritis in sexually active young men.

**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect because it does not match the description provided.
**Option B:** Incorrect as it does not align with the Gram-negative cocci seen in the Gram stain.
**Option C:** Incorrect because the clinical presentation and Gram stain results do not support this option.
**Option D:** Incorrect as the description does not fit the Gram stain findings of Gram-negative cocci.

**Clinical Pearl / High-Yield Fact**
It's crucial to remember that **Neisseria gonorrhoeae** infections can lead to serious complications if not treated promptly, including epididymitis and disseminated gonococcal infection. A key clinical correlation is the association between gonorrhea and other STIs, such as chlamydia.

**Correct Answer:** D. Neisseria gonorrhoeae

✓ Correct Answer: C. Gonococci