Consider a regression with two variables, in which X1i is the variable of interest and X2i is the control variable. Conditional mean independence requires
A) E(ui|X1i, X2i) = E(ui|X2i)
B) E(ui|X1i, X2i) = E(ui|X1i)
C) E(ui|X1i) = E(ui|X2i)
D) E(ui) = E(ui|X2i)
Answer: A
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