Instructions: In this task, you're given a question, along with a context passage. The passage will not have a direct answer to the question, but can include some information and a clue for the answer. Assuming you can only obtain information about one entity in the passage, your job is to determine whether information from the passage can be used to answer the question. Indicate your choice as 'a' for Yes or 'b' for No.
Input: Question: What is the total length of the river that Cromwell crossed on July 2 on his way to Edinburgh? Passage:Meanwhile, the motto frappez fort, frappez vite (French, strike hard, strike fast) was carried out at once by the regular forces. On 19 July, Cromwell made the final arrangements at Berwick-on-Tweed. Major-General Thomas Harrison, a gallant soldier and an extreme English Independent, a Fifth Monarchist, was to command the regular and auxiliary forces left in England, and to secure the Commonwealth against Royalists and Presbyterians. Cromwell took with him Lieutenant-General Charles Fleetwood and Major-General John Lambert, and his forces numbered about 10,000 foot and 5,000 horse. His opponent David Leslie (his comrade of Marston Moor) had a much larger force, but its degree of training was inferior, it was more than tainted by the political dissensions of the people at large, and it was, in great part at any rate, raised by forced enlistment. On 22 July, Cromwell crossed the river Tweed. He marched on Edinburgh by the sea coast, through Dunbar, Haddington and Musselburgh, living almost entirely on supplies landed by the fleet which accompanied him, for the country itself was incapable of supporting even a small army, and on 29 July, he found Leslie's army drawn up and entrenched in a position extending from Leith to Edinburgh.

Output:
b