This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anatomy
Reticular fibers of collagen tissues are present in all of the following except: 
Select and explain. 
A. Thymus, B. Spleen, C. Bone marrow, D. Lymph node
A: Thymus
Answer: A: Thymus 
Explanation: Ans: A. ThymusReticular fibers of collagen tissues are present in Spleen, Bone marrow & Lymph node but not in thymus.Reticulin:Type of fiber in connective tissue.Composed of type III collagen.Secreted by reticular cells.Reticular fibers crosslink to form a fine meshwork.Acts as a suppoing mesh in soft tissues such as liver, bone marrow & tissues and organs of lymphatic system.