Final answer:
Grapefruit juice is contraindicated while taking atorvastatin.
Step-by-step explanation:
The correct answer is a) Grapefruit juice. While taking atorvastatin, it is contraindicated to consume grapefruit juice. Grapefruit juice contains compounds that can interfere with the metabolism of atorvastatin, leading to higher levels of the medication in the bloodstream. This can increase the risk of side effects and adverse reactions.
Green tea, cranberry juice, and orange juice do not have any known interactions with atorvastatin. However, it's always a good idea to consult with a healthcare provider or pharmacist for specific information about any possible drug interactions.