- Lemon juice contains acid
- Milk contains proteins
- So, adding lemon juice to milk is similar to combining acid and protein together

- Adding lemon juice to milk is similar to combining acid and protein together
- Combining acid and protein can cause chemical change
- So, adding lemon juice to milk can cause chemical change

Therefore, adding lemon juice to milk can cause chemical change
Question: Which of the following causes a chemical change?
Context: - Combining acid and protein can cause chemical change 
- Lemon juice contains acid 
- Milk contains proteins