Question

multiple choice question
the two collecting ducts are the ______ ducts.

right and left
right and thoracic
cisterna chyli and thoracic
lymphatic and subclavian

Explanation:

In lymphatic system, the two main collecting ducts are the right lymphatic duct and the thoracic (left lymphatic) duct. The option "right and thoracic" matches this knowledge. Other options: "right and left" is incorrect as there's no left collecting duct in this context; "cisterna chyli and thoracic" - cisterna chyli is a sac, not a main collecting duct; "lymphatic and subclavian" - subclavian is a vein, not a collecting duct.

Answer:

B. right and thoracic (assuming the options are labeled as A. right and left, B. right and thoracic, C. cisterna chyli and thoracic, D. lymphatic and subclavian)