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: Pathology
[{'content': 'Early complement deficiency can manifest as? \nSelect and explain. \nA. Hereditary angioneurotic edema, B. Atypical HUS, C. SLE, D. PNH', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Deficiency of C1,C2,C4\xa0(early complement deficiency) can manifest as SLE and other collagen vascular disorders.', 'role': 'assistant'}]