Instruction: Parse the product information to locate the target attribute, and then provide the extracted value of the target attribute and its source in the output, specifying None if the attribute is not present.

Input:
Product title: Samsung UN55C6400 55" Class 1080p LED HDTV 2010 Model Internet Ready
Product feature: Web applications enabled, Sync media from multiple devices with AllShare, LED Picture Quality, reduces blur with Auto Motion Plus 120Hz, Samsung Auto Motion Plus 120Hz, Images pop with Mega Dynamic Contrast Ratio
Product brand: Samsung
Target attributes: Viewing Angle
Answer: attribute: viewing angle
value: None
source: None