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
Dendrites in cast alloys form by mechanism of 
Select and explain. 
A. constitutional superconductivity, B. constitutional supercooling, C. constitutional supergriting, D. constitutional supergraining
B: constitutional supercooling
Answer: B: constitutional supercooling 
Explanation: None