**Core Concept**

The Fairbank's triangle is a clinical landmark named after British surgeon Sir Archibald Fairbank. It is a triangular region located between the iliac crest, anterior superior iliac spine, and the anterior aspect of the greater trochanter of the femur. This triangular region is clinically significant as it helps in identifying the femoral nerve, artery, and vein, which are crucial structures during surgical procedures involving the hip joint and lower limb.

**Why the Correct Answer is Right:**

The correct answer is **D** as it correctly identifies the location of Fairbank's triangle as the region between the iliac crest, anterior superior iliac spine, and the anterior aspect of the greater trochanter of the femur. By understanding the anatomy and position of these landmarks, surgeons and medical professionals can accurately identify and protect the femoral nerve, artery, and vein during surgeries, minimizing complications and enhancing patient safety.

**Why Each Wrong Option is Incorrect:**

A. This choice incorrectly refers to the incorrect landmark, as it mentions the "pubic tubercle," which is not a part of Fairbank's triangle. This option should be eliminated.

B. This choice also refers to an incorrect landmark, mentioning "pubic symphysis." The pubic symphysis is located inferior to Fairbank's triangle and is not a part of it.

C. This choice incorrectly combines the correct landmark (iliac crest) with two incorrect ones (pubic tubercle and anterior superior iliac spine). Iliac crest is a part of the correct answer, but combining it with the other incorrect landmarks makes this option wrong.

**Clinical Pearl / High-Yield Fact:**

Understanding Fairbank's triangle and its relation to the femoral nerve, artery, and vein helps in performing safe surgeries involving the hip joint and lower limb, reducing the risk of nerve, artery, and vein injuries. This knowledge is crucial for surgical residents, orthopedic surgeons, anesthesiologists, and trainees in various medical specialties.

**Correct Answer:** D. Iliac crest, pubic tubercle, and anterior superior iliac spine are the correct landmarks for identifying Fairbank's triangle and its relation to the femoral nerve, artery, and vein.