I define a "Step III question" as something that you will only know after several years of practice or residency. I've seen a good number of them in UW and Kaplan Qbank. One example being "Sigmoid colon is involved in Merkel Diverticulum 75% times, but rectum is always involved." I was like "wow, good to know." See, I hate to sound like a person who whines a lot or blames the system. But Step I is Step ONE for a reason. There are Step TWO and THREE, which means we don't have to know everything right now. I really hope questions like these are the small minority on the real exam, because they are definitely not in First Aid, and I doubt they are even in other review books (for the example above, it's not in HY Embryology).