A 55 year old male presents with features of Obstructive Jaundice. He also reports a weight loss of seven kilograms in last two months. On CT scan, the CBD is dilated till the lower end and the main pancreatic duct is also dialated. Pancreas is normal.The most likely diagnosis is -
Choledocholithiasis
Carcinoma Gallbladder
Hilar Cholangiocarcinoma
Periampullary Carcinoma