A. white blood cell
B. red blood cells
C. phagocytes
D. leucocytes
Correct Answer:
Option B – red blood cells
Explanation
A red blood cell (erythrocytes), which (in humans) is typically a biconcave disc without a nucleus.
Erythrocytes contain the pigment haemoglobin, which imparts the red colour to blood, and transports oxygen and carbon dioxide to and from the tissues.