Question: Medco Health Solutions, Inc. was an American Pharmacy Benefits Management (PBM) company which served more than 65 million people, before it was ultimately acquired by Express Scripts, in April of which year?
Sentence (from "John O. Agwunobi"): At Walmart, Agwunobi was responsible for a chain of 4,000 retail, specialty and mail order pharmacies; more than 2,500 vision centers and 100 in-store convenient care clinics; and a pharmacy benefits management unit.
Relevant evidence: No