This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Statistical Errors, p-value, Subject name: Social & Preventive Medicine
All of the following are Subject bias except 
Select and explain. 
A. Recall bias, B. Selection bias, C. Hawthorne bias, D. None of above
B: Selection bias
Answer: B: Selection bias 
Explanation: Selection bias is a type of Investigator bias Hawthorne effect (Coho study) and Recall bias (Case control study) are types of Subject bias