This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Medicine
[{'content': 'WHO Ladder is for the rationale titration of - \nSelect and explain. \nA. Oral analgesia, B. Chemotherapy, C. Radiotherapy, D. Antidepressants', 'role': 'user'}, {'content': 'Answer: A \nExplanation: WHO Ladder is for the rationale titration of oral analgesia used in cancer paitents to relive their pain around the clock in more effective ways . Ref image - Researchgate.net', 'role': 'assistant'}]