Mark the odd one in each series
Thoracic duct; aorta; pulmonary vein; venae cavae.

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Solution

Explanation :
Aorta, pulmonary vein, and venae cavae are all concerned with the circulatory system (heart) while the thoracic duct is concerned with the lymphatic system.
For returning chyle or lymph to the systemic venous system, the thoracic duct is considered the main lymphatic vessel.
Hence, the odd one from the above series is the Thoracic duct.

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