This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General anatomy, Subject name: Anatomy
Low complement levels seen in 
Select and explain. 
A. PSGN, B. MPGN, C. Infective endocarditis, D. All the above
D: All the above
Answer: D: All the above 
Explanation: Ref Harrison 16/e p680 normal complement levelssuggest renal diseases such as immune complex disease, idiopathic rapidly progressive GN, and immunoglobulin G (IgG) or immunoglobulin A (IgA) nephropathy. Low C3 levels are found in almost all patients with acute poststreptococcal nephritis; C4 levelsmay be slightly low