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: Psychiatry
Best therapy suited to teach daily life skill to a mentally challenged child- 
Select and explain. 
A. CBT (Cognitive Behaviour Therapy), B. Contigency, C. Cognitive reconstruction, D. Self instruction
B: Contigency
Answer: B: Contigency 
Explanation: B. i.e. Contingency