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
With indirect spruing, which one of the following porosities can be minimised 
Select and explain. 
A. Back pressure porosity, B. localized shrinkage porosity, C. Pin hole porosity, D. Micro porosity
B: localized shrinkage porosity
Answer: B: localized shrinkage porosity 
Explanation: None