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
[{'content': 'All of the following are Subject bias except \nSelect and explain. \nA. Recall bias, B. Selection bias, C. Hawthorne bias, D. None of above', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Selection bias is a type of Investigator bias Hawthorne effect (Coho study) and Recall bias (Case control study) are types of Subject bias', 'role': 'assistant'}]