You are conducting a cohort study, and because of differential loss-to-follow-up, your sample has lost more of the exposed who ended up with the disease. What effect will this have on your estimate of the relative risk?
a) Our estimate will overstate the true risk
b) Our estimate will understate the true risk
c) Our estimate will not charge because those lost to follow up still get the disease
d) I don't have enough Information to answer this question