A.
anwered by: canteau
The Shimano DH-C60003 Dynamo hub with roller brake compatibility has the generator built in. You will need to add a front roller brake like the Shimano Nexus BR-IM45-F.
http://www.treefortbikes.com/product/333222394976/1228/Shimano-Nexus-BR-IM45-F.html