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: Pharmacology
One of the following is not a 5–HT receptor antagonist : 
Select and explain. 
A. Ketanserin, B. Lanreotide, C. Methysergide, D. Tropisetron
B: Lanreotide
Answer: B: Lanreotide 
Explanation: Lanreotide is a somatostatin analog used in acromegaly.