
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 triangle ABC, the exterior angle adjacent to angle A is 110°. In order for triangle ABC to be an isosceles triangle, the degree of angle B is (　　)

A．70°  
B．55°  
C．70° or 55°  
D．70° or 55° or 40°

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