Five colleagues: A, B, C, D, and E, are working on different projects: Alpha, Beta, Gamma, Delta, and Epsilon. A is not working on Alpha or Beta. B is working on Delta. C is working on Epsilon. What project is D working on?
Answer: C. Gamma
Since A cannot work on Alpha or Beta, and B is on Delta, A must be on Gamma, leaving D with the only remaining project.