Question

which is one treatment that is recommended for people with sickle cell disease?
pacmaker implant
calcium supplements
bone marrow transplant
healthy diet and exercise

Explanation:

Sickle cell disease is a genetic blood disorder. A bone marrow transplant can replace the abnormal stem cells (which produce sickle - shaped red blood cells) with healthy ones. A pacemaker implant is for heart rhythm problems. Calcium supplements are for bone health (not directly for sickle cell). While a healthy diet and exercise are good for general health, they are not a specific treatment for sickle cell disease like a bone marrow transplant.

Answer:

bone marrow transplant