Final answer:
The perineal lymph mainly drains to the inguinal lymph nodes, which is the correct answer for lymphatic drainage in the groin and perineal areas.
Step-by-step explanation:
The perineal lymph primarily drains to the inguinal lymph nodes. This is because the inguinal lymph nodes are located in the groin area and are responsible for draining lymph from regions inferior to the umbilical region, which includes the perineum. Although the internal iliac vein drains the pelvic organs and integument and flows into the common iliac vein, it is not the primary lymphatic drainage point for the perineal area. The popliteal lymph nodes drain the leg area, especially around the knee joint, and the axillary lymph nodes are involved in draining the upper limbs and breasts, so neither of these are the correct answer for perineal lymph drainage.