Final answer:
Statement b. "I will take aspirin for a headache" indicates a need for further teaching as it can increase the risk of bleeding for patients undergoing chemotherapy.
Step-by-step explanation:
Chemotherapy is a treatment for cancer that involves the use of drugs to kill cancer cells. It is important for patients undergoing chemotherapy to follow certain precautions to minimize the risk of complications. Based on the options given, statement b. "I will take aspirin for a headache" indicates a need for further teaching. This is because aspirin can increase the risk of bleeding, which can be a serious concern for patients undergoing chemotherapy.