Which of the Following Statements Is True for Mechanical Prosthetic

Which of the following statements is true for mechanical prosthetic valves versus biological valve?

A) Mechanical valves require the use of life-long anticoagulant therapy while biologic valves never require anticoagulant therapy
B) Mechanical valves last longer and thus are suitable for younger patients while biological valves deteriorate at a faster rate
C) Both mechanical and biological valves require the use of life-long anticoagulant therapy
D) Valve replacement cures the patient. None of the prosthetic valves need anticoagulation.