What is the most appropriate initial investigation for an elderly man with progressive jaundice, deep yellow sclera, dark urine, pale stool, a distended gallbladder (GB) with stones, and a dilated common bile duct (CBD)?

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What is the most appropriate initial investigation for an elderly man with progressive jaundice, deep yellow sclera, dark urine, pale stool, a distended gallbladder (GB) with stones, and a dilated common bile duct (CBD)?

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