In this edition of The Motley Fool's "Ask a Fool" series, Motley Fool One analyst Jason Moser takes a question from a reader who asks: "How will Obamacare affect UnitedHealthCare's (UNH 0.40%) bottom line?" Jason discusses that while there are many unknowns about how the Affordable Care Act will affect different companies, UnitedHealth has a number of growth opportunities ahead. Furthermore, while one of the greatest risks to UnitedHealth is the advent of a single-payer system, that is something that shouldn't concern investors today.