In the exercise "Odd one out," here are the answers:

**Exercise 1:**
1. **C** - cycling (all others are related to food or drinks)
2. **C** - fish (all others are foods)
3. **C** - health (all others are foods)
4. **C** - obesity (all others are related to exercise or activity)
5. **C** - headache (all others are related to activities)

**Exercise 2:**
1. **A** - have flu (common illness; others are specific symptoms)
2. **A** - have flu (common illness; others are specific symptoms related to teeth)
3. **D** - feel hungry (others are conditions of fatigue)
4. **D** - doing exercise (all others are hygiene-related activities)

Feel free to ask more questions!