Question: Don DaGradi started his animated features career with what 1955 romantic musical comedy-drama?
Sentence (from "Lady and the Tramp"): Based on "Happy Dan, The Whistling Dog" by Ward Greene, "Lady and the Tramp" tells the story of a female American Cocker Spaniel named Lady who lives with a refined, upper-middle-class family, and a male stray mongrel called the Tramp.
Relevant evidence: No