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
[{'content': 'All of the following effects are produced by inhibitors of prostaglandin synthesis EXCEPT : \nSelect and explain. \nA. Prolongation of bleeding time, B. Prolongation of prothrombin time, C. Prolongation of labour, D. Gastric mucosal damage', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]