**Core Concept:** Nephrotic syndrome is a clinical presentation characterized by significant proteinuria, hypoalbuminemia, hyperlipidemia, and edema. It can be caused by various underlying conditions affecting the kidney glomeruli, including drug-induced nephrotoxicity.

**Why the Correct Answer is Right:** Amphotericin B is a polyene antifungal agent that can lead to nephrotoxicity, resulting in nephrotic syndrome. Amphotericin B interacts with cell membranes, disrupting them and causing cellular injury. In the kidney, this can lead to glomerular damage and subsequently nephrotic syndrome.

**Why Each Wrong Option is Incorrect:**

A) Gold (Intravenous gold salts) is primarily used for rheumatoid arthritis treatment and is not directly associated with nephrotic syndrome development.
B) Amphotericin B is the correct answer, as mentioned earlier.
C) Rifampicin is an antibiotic used in the treatment of tuberculosis and is not typically associated with nephrotic syndrome.
D) Ibuprofen is a nonsteroidal anti-inflammatory drug (NSAID) used for pain and inflammation management. While it can cause acute kidney injury, it is not directly linked to nephrotic syndrome.
E) Captopril is an angiotensin-converting enzyme (ACE) inhibitor used for hypertension and diabetic nephropathy management. It is not directly implicated in nephrotic syndrome development.

**Clinical Pearl:** Although nephrotoxicity can be a side effect of some medications, the correct answer (Amphotericin B) is mainly responsible for nephrotic syndrome due to its direct glomerular toxicity. In contrast, other options are either not linked to nephrotic syndrome or cause nephrotoxicity without directly leading to nephrotic syndrome.