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
A 40 year old male patient complains of decayed tooth. Patient gives history of cavity preparation and restoration with mixture of spherical alloy particles and mercury done with 26. Intra-oral examination reveals proximal caries with 26. Which of the following is not the property of alloy particles used to restore the tooth in this patient?​ 
Select and explain. 
A. Packed efficiently, B. Requires less mercury, C. Decrease fluidity of the mixture, D. Less resistance to particle sliding​
C: Decrease fluidity of the mixture
Answer: C: Decrease fluidity of the mixture 
Explanation: It was demonstrated that​ by spherodizing the alloy particles, the particles​ packed more efficiently and required​ much less mercury to make a practical mixture. Spherical particles also increased the fluidity of the mixture by​ presenting less resistance to particle sliding. Using some​ or all spherical alloy particles, it is possible to reduce the​ mercury portion of the mixture to less than 50% by​ weight.​
Reference: Sturdevant’s Art and Science of Operative Dentistry, Mosby, 4th Edition, Page No: 149