Question

Mark the odd one in each of the following series:
Thoracic duct, aorta, pulmonary vein, vena cava.

Answer 1

Aorta, pulmonary vein, vena cava are all related to the circulatory system (heart). While the thoracic duct is related to lymphatic system. It is the larger of two lymph ducts of the limphatic system. It carries chyle, a liquid containing both lymph and emulsifier fats rather, rather than pure lymph.

So the correct option is thoracic duct.