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
The chief advantage of zinc phosphate cement is its: 
Select and explain. 
A. Good compressive strength, B. Film thickness, C. Lack of irritation, D. Low solubility
B: Film thickness
Answer: B: Film thickness 
Explanation: Film thickness
The smaller the particle size, less is the film thickness. The thickness is lesser than the size of the particles because, during mixing the particles are crushed and dissolved. The thickness can also be reduced by applying pressure on the casting during seating.
This is the chief advantage of zinc phosphate.
Ref- Manapallil 3rd ED P:92