Which of the following is a colourless fluid?

Blood and lymph are the two types of body fluids found in the body.

White blood cells (lymphocytes) target and eliminate pathogens from the body. They are found in the colourless fluid called lymph. Lymph lacks RBCs, which is why it is colourless. 

The red pigment haemoglobin is found in red blood cells, also known as erythrocytes, which are present in the blood.