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: Medicine
All of the following statements about hyponatremia are true, except: 
Select and explain. 
A. Pseudohyponatremia is associated with low plasma osmolality, B. Hyponatremia associated with hyperglycemia has high plasma osmolality, C. Hyponatremia associated with SIADH is normovolemic, D. NSAIDs increase the potency of vasopressin
A: Pseudohyponatremia is associated with low plasma osmolality
Answer: A: Pseudohyponatremia is associated with low plasma osmolality 
Explanation: Pseudohyponatremia is associated with normal serum osmolarity. In this condition the aqueous fraction of plasma is decreased and the paiculate fraction is increased. This can result from hyperlipidemia (TG>1500mg/dl), hypercholesterolemia or hyperprotenemia (as in multiple myeloma, waldenstroms macroglobulinemia, administration of intravenous immunoglobulin) Ref: Nephrology in 30 Days By Robe F. Reilly, Mark A. Perazella, page 38; Goldfrank's toxicologic emergencies By Lewis R. Goldfrank, Neal Flomenbaum, page 287; Goldfrank's toxicologic emergencies By Lewis R. Goldfrank, Neal Flomenbaum, page 288; Textbook Of Pharmacology By Seth 3rd edn, page29