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 are adverse effects of thalidomide except : \nSelect and explain. \nA. Myocarditis, B. Constipation, C. Peripheral neuropathy, D. Sedation', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Thalidomide was banned because of teratogenic effects (phocomelia). Now it has come again in the market for use as an anticancer drug in multiple myeloma and melanoma.\nLenalidomide is its more potent and non-teratogenic derivative.\nThalidomide most commonly causes sedation and constipation in cancer patients. It can also cause peripheral sensory neuropathy.\nTwo enantiomers of thalidomide (R and S) are present but these are interconvertible in the body, therefore racemic mixture is used.', 'role': 'assistant'}]