Final answer:
The largest lymphatic duct is the thoracic duct, which drains the majority of the body, including the lower right limb, into the left subclavian vein.
Step-by-step explanation:
The largest lymphatic duct, which runs along the anterior vertebral column, is the thoracic duct. This duct is responsible for draining lymph from the lower limbs, left thorax, left upper limb, and the left side of the head. Unlike the thoracic duct, the right lymphatic duct drains lymph fluid only from the upper right side of the body into the right subclavian vein. Lymph from the lower right limb enters the bloodstream through the thoracic duct after being collected from the right lumbar trunk into the cisterna chyli, which is the starting point of the thoracic duct.