
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
In an isosceles triangle where the base angles are equal and denoted as $a^\circ$ and the vertex angle as $b^\circ$, it is given that both angles are prime numbers and the sum of all angles is less than 200 degrees. If $a > b$, what is the least possible value of $b$?
A) 2
B) 3
C) 5
D) 7
E) 11

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