The correct option is B Spleen
Spleen is the largest lymph node of body. A special type of connective tissue is filled in spleen, which is called pulp. Splenic pulp has two parts - white pulp and red pulp. The white pulp is scattered in the form of patches of long and irregular sized lymphatic endothelium. The meshes of this network are studded with numerous splenic cells and lymphocytes. The red pulp forms major part of spleen. It is reddish in colour due to excessive RBCs. It is made up of venous sinuses. Red pulp of spleen contains erythrocytes and blood filled sinuses.