This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Oncology, Subject name: Medicine
[{'content': 'Which of the following is most common cancer leading to death? \nSelect and explain. \nA. Lung cancer, B. Oral cancer, C. Skin cancer, D. Prostate cancer', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. (a) Lung cancerRef.-.Table 81.1 Harrison 18th EditionThe most common cancer in the world is lung cancer, and it is the most common cause of cancer related death.', 'role': 'assistant'}]