Given a sentence, fill in the blank with the most suitable noun from a selected list of nouns.
The teacher was teaching the students ________ 
Nouns: mathematics, history, chemistry
The teacher was teaching the students mathematics.
Complete the following task based on the instruction and optional input provided.### Instruction:
Given a sentence, fill in the blank with the most suitable noun from a selected list of nouns.

### Input:
The teacher was teaching the students ________ 
Nouns: mathematics, history, chemistry

### Output:
The teacher was teaching the students mathematics.