<prompt> Which of the following drugs is capable of maintaining blood levels for 24 hours after a single administration but has useful antianginal effects lasting only about 10 hours?Amyl nitriteIsosorbide mononitrateNitroglycerine sublingualNitroglycerine transdermal  <response>: Ref: KDT 6e p525 Continous presence of nitrates in blood will result in tolerance. 