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Can anyone please help me with the answer with explanations

A 60 year old man is brought to the emergency department because of generalized weakness for 6 hours. The onset of this symptoms occurred 2 hours after he took 4 tablets( rather than his usual one tablet) of a medication that prevents angina pectoris. Pulse 36/min BP 100/50. After the administration of isoprotenol is pulse 60/min. which of the following best describes the MOA of this pt. usual chronic medication?

Irreversible, dose dependent
Irreversible, dose independent
Reversible, dose dependent
Reversible, dose independent


Reversible, dose dependent is correct. I did this form online with feedback and I got this question right.
thanks