Question: Alice Walton is the wealthiest woman in the world, according to maganize Forbes, what other Walton was listed as the 11th richest person in the world in October 2012?
Sentence (from "S. Robson Walton"): Samuel Robson "Rob" Walton (born October 28, 1944) is an American businessman and is the eldest son of Helen Walton and Sam Walton, founder of Walmart, the world's largest retailer.
Relevant evidence: No