Final answer:
Lymph from areas below the pectinate line of the body is primarily drained to the internal iliac (hypogastric) lymph nodes. So, the correct answer is option A) Internal iliac (hypogastric) lymph nodes.
Step-by-step explanation:
The question pertains to the region of the body's lymphatic system that is responsible for draining lymph from areas below the pectinate line. Based on anatomical understanding, the correct answer to the question - 'Below the pectinate line, lymph is primarily drained to which lymph nodes?' - is the Internal iliac (hypogastric) lymph nodes (A).
The thoracic duct, mentioned in the reference information, is responsible for receiving lymph from the lower abdomen, pelvis, and lower limbs via the lumbar trunks and intestinal trunk and begins at the cisterna chyli. However, lymph draining from areas below the pectinate line primarily goes to the internal iliac lymph nodes, not to the thoracic duct directly.