Biogen on Tuesday reported fourth-quarter revenue and profit that shrank from a year ago, as it recorded charges related to dropping its controversial Alzheimer’s drug Aduhelm and as sales slumped in its multiple sclerosis therapies, the company’s biggest drug category. Biogen booked sales of $2.39 billion for the quarter, down 6% from the same period a year ago. It reported net income of $249.7 million, or $1.71 per share, for the fourth quarter, down from net income of $550.4 million, or $3...