Oral Contraceptive (0C) use is hypothesized to increase the risk of stroke. Assume that oral contraceptive use is inversely associated with age (younger women are more likely to use 0C5 compared to older women], and that age is positively associated with stroke (older women are more likely to have a stroke compared to younger women). a. Is age associated with the exposure? The outcome? Is it in the causal pathway of interest