A loss of sensation in the lower lip may be produced by
1. Bell's palsy.
2. metastatic malignancy to the body of the mandible.
3. trigeminal neuralgia.
4. fracture in the mandibular first molar region.

(2) and (4)

(1) (2) (3)

(1) and (3)

All of the above.

(4) only