
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
At Urban General Hospital, triplets, quadruplets, and quintuplets accounted for a total of 2500 babies born in one year. There were two times as many sets of triplets as sets of quadruplets, and the number of sets of quintuplets was half as many as the sets of quadruplets. How many of these 2500 babies were in sets of quintuplets?
**A)** 200
**B)** 400
**C)** 500
**D)** 1000
**E)** 1200

Present the answer in LaTex format: \boxed{Your answer}
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