**Core Concept**
The external oblique muscle is one of the muscles of the anterior abdominal wall, playing a crucial role in movements such as flexion and rotation of the torso. It also contributes to the formation of the aponeuroses that make up part of the abdominal wall. Understanding its anatomy is essential for comprehending abdominal wall structure and function.

**Why the Correct Answer is Right**
The external oblique aponeurosis contributes to the formation of the inguinal ligament, the external or superficial inguinal ring, and the linea alba, but it does not form the conjoint tendon (or falx inguinalis), which is formed by the fusion of the aponeuroses of the internal oblique and transversus abdominis muscles.

**Why Each Wrong Option is Incorrect**
**Option A:** This choice might be related to structures formed by the external oblique, but without specifics, it's hard to address directly.
**Option B:** Similarly, without knowing the specifics of this choice, we can't directly refute it, but the question hints at an exception to the formations by the external oblique.
**Option C:** This could potentially be correct depending on what it says, as we are looking for an exception.
**Option D:** If this option mentions something like the conjoint tendon, it could be the correct answer because the conjoint tendon is not formed by the external oblique.

**Clinical Pearl / High-Yield Fact**
Remembering that the conjoint tendon is formed by the internal oblique and transversus abdominis muscles, not the external oblique, is crucial for understanding abdominal wall anatomy and inguinal hernia repair.

**Correct Answer:** D. conjoint tendon