The respiratory pigment in human beings isChlorophyllXanthophyllHaemoglobinHaemosiderin

The respiratory pigment in human beings is Haemoglobin.

Haemoglobin is a complex protein found in red blood cells, responsible for carrying oxygen from the lungs to the rest of the body and returning carbon dioxide from the tissues back to the lungs. Unlike chlorophyll, which is found in plants and is involved in photosynthesis, and xanthophyll, which is a pigment in plants, haemoglobin specifically plays a crucial role in human respiration and maintaining oxygen levels in the blood. Haemosiderin, on the other hand, is a storage form of iron, not directly involved in respiration.

Thus, the correct answer to the question posed is Haemoglobin.