This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Autacoids, Subject name: Pharmacology
One of the following is not a 5HT receptors on antagonist 
Select and explain. 
A. Ketanserine, B. Lanreotide, C. Methylsergide, D. Tropisetron
B: Lanreotide
Answer: B: Lanreotide 
Explanation: Lanreotide is a medication used in the management of acromegaly and symptoms caused by neuroendocrine tumors, most notably carcinoid syndrome. It is a long-acting analogue of somatostatin, like octreotide Refer kDT 6/e p166