**Core Concept**
The genicular anastomosis is a network of arteries in the thigh that provides collateral blood supply to the lower limb in cases of occlusion of the main arterial trunks. This anastomosis involves the anastomotic connections between the femoral, popliteal, and genicular arteries.

**Why the Correct Answer is Right**
In the presence of a thrombotic occlusion of the femoral artery in the proximal part of the adductor canal, the genicular anastomosis would be activated to provide blood supply to the leg. The genicular arteries, including the superior and inferior genicular arteries, would increase their blood flow to compensate for the reduced blood supply from the occluded femoral artery. The superior genicular artery, which arises from the femoral artery distal to the occlusion, would be the primary contributor to the genicular anastomosis.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because the popliteal artery is also occluded in this scenario, making it an unlikely contributor to the genicular anastomosis.
* **Option B:** This option is incorrect because the anterior tibial artery is a branch of the popliteal artery and would not be able to provide significant collateral blood flow in this scenario.
* **Option D:** This option is incorrect because the posterior tibial artery is also a branch of the popliteal artery and would not be able to provide significant collateral blood flow in this scenario.

**Clinical Pearl / High-Yield Fact**
The genicular anastomosis is a critical collateral pathway that can provide blood supply to the lower limb in cases of occlusion of the main arterial trunks. Understanding the anatomy and physiology of this anastomosis is essential for diagnosing and managing peripheral arterial disease.

**Correct Answer: C. The superior genicular artery. The superior genicular artery.**