**Core Concept**
The mid-inguinal point is a significant anatomical landmark used to estimate the location of the femoral artery and vein. It serves as a reference point for various surgical and clinical procedures.

**Why the Correct Answer is Right**
The mid-inguinal point is defined as the midpoint between the anterior superior iliac spine (ASIS) and the pubic symphysis. This location is crucial because it approximates the site where the femoral artery and vein can be palpated. The ASIS is a bony landmark on the ilium, while the pubic symphysis is a cartilaginous joint between the two pubic bones. The midpoint between these two structures is used to estimate the location of the femoral vessels, which are essential for vascular access and other medical procedures.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the pubic tubercle, not the pubic symphysis, is used in conjunction with the ASIS to estimate the location of the femoral vessels. The pubic tubercle is a bony projection on the pubic bone.
**Option C:** This option is incorrect because the ASIS is not used in conjunction with another ASIS to estimate the location of the femoral vessels. The ASIS serves as a single reference point.
**Option D:** This option is incorrect because the mid-point of the inguinal ligament is not a reliable reference point for estimating the location of the femoral vessels. The inguinal ligament is a fibrous structure that forms the floor of the inguinal canal.

**Clinical Pearl / High-Yield Fact**
When attempting to palpate the femoral vessels, it is essential to locate the mid-inguinal point, which is approximately 1-2 cm below the midpoint between the ASIS and the pubic symphysis. This location can help guide the placement of vascular access devices.

**✓ Correct Answer: B. Mid point of ASIS and pubic symphysis**