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Which bone is located on the thumb side of the lower forearm?

  1. Ulna

  2. Femur

  3. Radius

  4. Tibia

The correct answer is: Radius

The ulna and radius are both located in the lower forearm, but the ulna is on the pinky side while the radius is on the thumb side. The femur and tibia are both bones of the leg, not the lower forearm. So the correct answer is the radius, as it is located on the thumb side of the lower forearm.