<prompt> Which of the following is an active metabolite of another drug and is available as a separate drug for the treatment of angine?Isosorbide mononitrateIsosorbide dinitrateNitroglycerinePropanolol  <response>: Ref: KDT 6e p525 It is a metabolite of isosorbide dinitrate and is also available as a separate drug. It undergoes least first pass metabolism. 