Final answer:
The medical assistant should recommend the Alzheimer's Association to the adult son of the dementia patient for support and resources to manage his mother's care effectively.
Step-by-step explanation:
If a medical assistant is advising the adult son of an 81-year-old patient with dementia who feels overwhelmed, they should recommend reaching out to the Alzheimer's Association. The Alzheimer's Association provides a wealth of support and resources for patients and their families, including caregiver support groups, educational materials, and guidance on managing the disease. This organization is dedicated to helping those affected by Alzheimer's and other dementias, offering community-based assistance that can relieve some of the burden family caregivers face.