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: Unknown
[{'content': 'Which of the following feature will help us to arrive at a conclusive diagnosis? \nSelect and explain. \nA. Rancid smelling wax like substance, B. Foul smelling oily liquid, C. Has no particular smell, D. None of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Rancid smelling wax like substance', 'role': 'assistant'}]