Final answer:
A centrifuged blood sample in a Red Top Tube yields serum, which is the liquid component left after the blood has clotted and the clotting factors have been removed.
Step-by-step explanation:
After centrifuging a blood sample in a Red Top Tube, which does not contain any anticoagulant agents, the liquid component obtained is serum. Serum refers to the part of blood left after clotting has occurred, which means the clotting factors have been removed. In contrast, plasma is the liquid component of blood containing the clotting factors, and is typically separated from whole blood using tubes containing anticoagulant agents, like EDTA or lithium heparin.