Based on the news about the stock in the past five trading days, please predict the rise or fall of the stock in the next trading day. If the stock is predicted to rise in the next trading day, please output [Rise], if the stock is predicted to fall in the next trading day, please output [Decrease].

Date:2020-12-17, Stock:UNH, The news for the past five days is as follows:
2020-12-10: NEWS1: A Vaccine Snag Could Slam the Economy and Lift These Stocks.
2020-12-11: nan
2020-12-14: NEWS1: UnitedHealth Group (UNH) Stock Moves -0.28%: What You Should Know.NEWS2: UnitedHealthcare Introduces Enhancements for Wearable Device Well-being Program, Including Access to Apple Fitness+ at No Additional Cost.
2020-12-15: NEWS1: Here's Why You Should Hold Cigna (CI) Stock in Your Portfolio.NEWS2: 3 Health Insurers That Crushed S&P YTD, Set to Rise Further.NEWS3: 20 Biggest Healthcare Companies By Revenue.
2020-12-16: nan

Answer: Rise