
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 a geometric sequence with positive terms {an}, given that $a_1a_5 + 2a_3a_6 + a_1a_{11} = 16$, the value of $a_3 + a_6$ is (　　).
　 A． 3 B． 4 C． 5 D． 6

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