system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Amount of drug left after four plasma half lives-
assistant
The correct answer is  Ans. is 'a' i.e., 6.25% Half life Drug left After 1 t'" 50% After 2 t'" 25% After 3 til2 125% After 4 t"2 6.25% After 5 ty2 3.125%