对，一个人肚子疼，另一个人头疼。

Correct, one has a stomachache, the other has a headache.

Source: Tatoeba

Sentence Composition

1 对 duì
  1. right; correct
  2. towards; at; for
  3. concerning; regarding
  4. to treat (sb a certain way)
  5. to face
  6. (bound form) opposite; facing; matching
  7. to match together; to adjust
  8. to fit; to suit
  9. to answer; to reply
  10. to add; to pour in (a fluid)
  11. to check; to compare
  12. classifier: couple; pair
2 一个人 yīgèrén
  1. by oneself (without assistance)
  2. alone (without company)
3 肚子疼 duzìténg to have a stomachache; to have a bellyache
4 另一 lìngyī
  1. another
  2. the other
5 个人 gèrén
  1. individual
  2. personal
  3. oneself
6 头疼 tóuténg headache