Drug response can be impacted by several factors including diet, comorbidities, age, weight, drug–drug interactions, and genetics. Individual genetic variation in key genes involved in the metabolism, transport, or drug target can contribute to risk of adverse events108 or treatment failure.
The answer is b. it is indirect therefore if it doesn't touch it it cant contaminate it
Its important to know how to find and check your pulse rate because if you want to excercise and make sure it gets your heart pumping, you need to know how to check your pulse rate before and after to make sure theres quite a difference.