This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Gastrointestinal System, Subject name: Physiology
Liver synthesises all except 
Select and explain. 
A. C3 complement component, B. Haptoglobin, C. Fibrinogen, D. Immunoglobulin
D: Immunoglobulin
Answer: D: Immunoglobulin 
Explanation: Immunoglobulins are synthesized by the B-lymphocytes.