This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunology, Subject name: Microbiology
Cryoglobulins are present in blood in which of the following clinical scenarios 
Select and explain. 
A. Macroglobulinaemia, B. SLE, C. Myeloma, D. All the above
D: All the above
Answer: D: All the above 
Explanation: Cryoglobulins if present in blood, form precipitates in patients serum when it is cooled down. They are a type of abnormal immunoglobulin disorder Ref: Textbook of Microbiology Baveja 5th ed Pg 102