Final answer:
The male client with CAD needs more teaching if he believes that the effectiveness of sublingual NTG is determined by the burning sensation under his tongue.
Step-by-step explanation:
The statement that indicates the client needs more teaching is b. 'If the tablets do not burn under my tongue, they are not effective.'
The burning sensation that can occur with sublingual NTG is a common side effect, and it does not determine the effectiveness of the medication. It is important to educate the client that they should not rely on the burning sensation to assess the medication's effectiveness. The other statements mentioned show a good understanding of the correct use and storage of sublingual NTG.