Okay, let's tackle this question about piedra. The user mentioned that the options A to D are missing, but the correct answer is provided. Hmm, I need to figure out what the question is really asking. The question is asking which statement is NOT true about piedra. Piedra is a fungal infection of the hair, right? There are two types: white piedra and black piedra.

First, the core concept here is about the characteristics of piedra. I remember that piedra is caused by fungi like Trichosporon for white piedra and Piedraia hortae for black piedra. The infection leads to nodules on the hair shaft. So the core concept is the etiology, clinical features, and diagnosis of piedra.

Now, the correct answer is supposed to be the exception. Let's think about common misconceptions. One possible incorrect statement might be about treatment. For example, if an option says that piedra is treated with oral antifungals when in reality it's usually self-limiting, that would be wrong. Or maybe a statement about the causative organism being a dermatophyte, which it's not—Trichosporon is a yeast.

Looking at the possible wrong options: Let's say one option says "Piedra is caused by dermatophytes." That's incorrect because it's caused by Trichosporon or Piedraia. Another incorrect option could be about the appearance; white piedra has white nodules, black has dark. If an option states the opposite, that's wrong. Also, maybe a statement that it's a superficial infection without affecting the hair shaft—no, it does affect the shaft by causing nodules.

The clinical pearl here is to remember the causative organisms and that it's not a dermatophyte infection. Also, the treatment is usually not required as it's self-limiting, so if an option suggests aggressive treatment, that's a red flag.

Putting it all together, the correct answer is the one that incorrectly attributes the causative agent or treatment method. For example, if option C says "Treated with oral griseofulvin," that's wrong because it's not typically treated with systemic antifungals. Instead, it's managed with clipping the hair or maybe topical treatments if needed.

**Core Concept**
Piedra is a fungal infection of the hair shaft caused by *Trichosporon* (white piedra) or *Piedraia hortae* (black piedra). It forms hard nodules on hair, distinguishing it from dermatophytosis. The infection is chronic, non-scarring, and typically asymptomatic.

**Why the Correct Answer is Right**
The correct answer identifies an exception to piedra's characteristics. For example, if an option claims it is caused by dermatophytes, this is incorrect. *Trichosporon* and *Piedraia* are yeast-like fungi, not dermatophytes. Clinical features include firm nodules on hair (white or black), but the infection does not involve the scalp or skin, nor does it require systemic antifungal therapy in most cases.

**Why Each Wrong Option is Incorrect**
**Option A:** Incorrect if it states "Piedra is a superficial fungal infection of the skin." It affects hair shafts, not skin.
**Option

✓ Correct Answer: B. White piedra is caused by piedrae hortae