Final answer:
Nitroglycerin should be avoided in patients who have taken Viagra in the last 12 hours.
Step-by-step explanation:
Nitroglycerin should be avoided in patients who have taken Viagra (sildenafil nitrate) in the last 12 hours.
Viagra is a PDE5 inhibitor that can interact with nitroglycerin and cause a dangerous drop in blood pressure. Nitroglycerin is used to treat conditions such as angina and heart attack, and combining it with Viagra can result in severe hypotension.
Therefore, option B) is the correct answer.