This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Urinary tract, Subject name: Pathology
Donath Landsteiner is seen in - 
Select and explain. 
A. PNH, B. Waldenstrom's macroglobulinemia, C. Paroxysmal cold hemoglobinuria, D. Malaria
C: Paroxysmal cold hemoglobinuria
Answer: C: Paroxysmal cold hemoglobinuria 
Explanation: Paroxysmalcoldhaemoglobinuria (PCH). In PCH, the cold antibody is an IgG antibody (Donath-Landsteiner antibody) which is directed against P blood group antigen and brings about complement-mediated haemolysis. Attacks of PCH are precipitated by exposure to cold. PCH is uncommon and may be seen in association with teiary syphilis or as a complication of ceain infections such as Mycoplasma pneumonia, flu, measles and mumps HARSH MOHAN Textbook of pathology 6th edition pg no 313