Marine teleost fishes excrete
a)	Uric acid	b)	Ammonia	c)	Urea	d)	None of these

(d)

In certain marine mollusus, crustaceans and teleost fishes, the excretory product is TMO (trimethylamine oxide). In these animals, ammonia is converted into trimethylamine (TMA) after its methylation. Thus, either TMA or its oxidation product trimethyl oxide (TMO) is the excretion product in these causes.