问题
单项选择题
A scientist working for a pharmaceutical company tries many models using the same data before reporting the one that shows that the given drug has no serious side effects. The scientist is guilty of:（）
A. look -ahead bias.
B. time -period bias.
C. data mining.
答案
参考答案：C
解析：
Data mining is the process where the same data is used with different methods until the desired results are obtained.