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: Dental
Pure gold has a density of 19.3 g/cm3. The apparent density of the direct filling gold restoration after condensation is most often: 
Select and explain. 
A. Equal to 19.3 g/cm3, B. More than 19.3 g/cm3, C. Less than 19.3 g/cm3, D. Can be more or less than 19.3 g/cm3
C: Less than 19.3 g/cm3
Answer: C: Less than 19.3 g/cm3 
Explanation: The maximal density of gold is 19.3 g/cm3. The density values shown in Table indicates the presence of voids in all direct gold restorations. Apparently, voids are inevitable, but they should be kept to a minimum to achieve the maximal strength attainable.