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: Psychiatry
[{'content': 'A person who laughs one minute and cries other minute has: \nSelect and explain. \nA. Incongruent effect, B. Euphoria, C. Labile effect, D. Split personality', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Labile effect', 'role': 'assistant'}]