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The ulna bone is located on the side of the lower arm closest to which finger?

  1. Thumb

  2. Middle finger

  3. Little finger

  4. Index finger

The correct answer is: Little finger

The ulna bone is located on the side of the lower arm closest to the little finger. This is because the ulna is one of the two bones in the forearm, with the other being the radius. The ulna runs along the pinky side of the arm, while the radius is on the thumb side. The index finger and middle finger are closer to the radius bone, making them incorrect options.