Concept:Haemoglobin is a red, iron-containing pigment inside red blood cells that transports oxygen.
Explanation:Haemoglobin is not yellowish; it gives blood its red colour.
It is not a red blood cell itself, but a pigment carried within red blood cells.
It is not involved in blood clotting; that function belongs to platelets.
Haemoglobin binds oxygen in the lungs and releases it to body tissues.
Therefore, it is best described as an oxygen-carrying pigment.
Answer:C. an oxygen carrying pigment