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: Microbiology
Soluble components of complement system account for about 
Select and explain. 
A. 1-2 mg/ml of total serum protein, B. 3-4 mg/ml of total serum protein, C. 5-7 mg/ml of total serum protein, D. 7-8 mg/ml of total serum protein
B: 3-4 mg/ml of total serum protein
Answer: B: 3-4 mg/ml of total serum protein 
Explanation: None