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: Sony VAIO VGN-UX380N 4.5-inch Laptop (Intel Core Solo Processor U1500, 1 GB RAM, 40 GB Hard Drive, Vista Business)
Product description: Amazingly small micro PC fits in your hand--4.5 inch LCD touch screen and hidden keyboard40 GB hard disk drive 1.33 GHz Ultra Low Voltage Intel Core Solo U1500 processor 1 GB RAMTri-mode WiFi (802.11a/b/g) wireless Wide Area Network (WWAN) with Cingular SIM card Bluetooth connectivityOne built-in USB 2.0 port and Memory Stick slot; includes port replicator with three USB one FireWire Ethernet VGA out composite A/V outPre-installed with Windows Vista Business
Product feature: Amazingly small micro PC fits in your hand--4.5 inch LCD touch screen and hidden keyboard, 40 GB hard disk drive, 1.33 GHz Ultra Low Voltage Intel Core Solo U1500 processor, 1 GB RAM, Tri-mode WiFi (802.11a/b/g), wireless Wide Area Network (WWAN) with Cingular SIM card, Bluetooth connectivity, One built-in USB 2.0 port and Memory Stick slot; includes port replicator with three USB, one FireWire, Ethernet, VGA out, composite A/V out, Pre-installed with Windows Vista Business
Product price: $558.00
Product brand: Sony
Target attributes: Screen Size
Answer: attribute: screen size
value: 4.5 inch
source: product feature
attribute: screen size
value: 4.5-inch
source: product title
attribute: screen size
value: 4.5 inch
source: product description