**Core Concept**
Trichobezoars are a type of **bezoar**, which is a mass found in the gastrointestinal tract. They are composed of swallowed hair, and their formation is often associated with **trichophagia**, a condition where individuals compulsively eat their own hair.

**Why the Correct Answer is Right**
The correct answer would depend on the specifics of each option, but generally, trichobezoars can cause **gastrointestinal obstruction**, **weight loss**, and **abdominal pain**. They are more common in individuals with **psychiatric disorders** that lead to trichophagia.

**Why Each Wrong Option is Incorrect**
**Option A:** Without specifics, it's hard to comment, but if it states trichobezoars are always symptomatic, this might be incorrect because some can be asymptomatic.
**Option B:** Similarly, without specifics, if it claims trichobezoars only occur in females, this would be incorrect as they can occur in anyone with trichophagia.
**Option C:** If it suggests trichobezoars are always successfully treated with endoscopy, this is incorrect because some cases may require surgical intervention.
**Option D:** Details would be needed, but if it claims trichobezoars are made of something other than hair, this would be incorrect.

**Clinical Pearl / High-Yield Fact**
A key point to remember is that trichobezoars can lead to **Rapunzel syndrome**, a condition where the hair extends past the stomach into the small intestine, potentially causing more severe complications.

**Correct Answer:** D. Trichobezoars are not always made of hair.