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
Which of the following feature will help us to arrive at a conclusive diagnosis? 
Select and explain. 
A. Rancid smelling wax like substance, B. Foul smelling oily liquid, C. Has no particular smell, D. None of the above
A: Rancid smelling wax like substance
Answer: A: Rancid smelling wax like substance 
Explanation: Rancid smelling wax like substance