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: GROHE 19914000 Start Pbv Set Conc. Bath US
Product description: Start starlight chrome 1-handle shower faucet with multi-function showerhead starlight chrome finish shower faucet from the start collectionsingle-handle allows you to quickly adjust the volume and temperature to your desired level.
Product feature: Starlight Chrome finish shower faucet from the start collection, Single-handle allows you to quickly adjust the volume and temperature to your desired level, Pressure balance maintains preset temperature when water pressure suddenly drops. Scald guard protects from sudden hot/freezing water when a toilet is flushed or dishwasher starts
Product brand: GROHE
Target attributes: Finish
Answer: attribute: finish
value: chrome
source: product feature
attribute: finish
value: chrome
source: product description