What is a common side effect of many medications in the elderly?

B is the correct answer because confusion and an increased risk of falls are significant concerns related to medication side effects in the elderly population. Many medications, particularly those affecting the central nervous system, can lead to cognitive impairment or altered mental status, which may manifest as confusion. Additionally, these cognitive effects can impact balance and coordination, contributing to a higher likelihood of falls among older adults.

Older individuals often metabolize medications differently than younger people, resulting in increased sensitivity to side effects. It's crucial for caregivers and healthcare providers to monitor elderly patients closely for these issues, ensuring their safety and well-being. In contrast, while sleepiness, frequent headaches, and reduced appetite can occur as side effects in some cases, they do not pose the same direct threat to safety and independence as confusion and falls.