This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Chemotherapy, Subject name: Pharmacology
[{'content': 'Which of the following drugs was initially developed as an antitubercular drug but later found to have mood elevating propeies \nSelect and explain. \nA. Isoniazid, B. Selegeline, C. Fluoxetine, D. Lithium', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Refer Goodman Gilman 12th/1558. Isoniazid caused euphoria as an adverse effect. This lead to development of structurally similar drugs as antidepressants', 'role': 'assistant'}]