Instructions: In this task, you're given passages that contain mentions of names of people, places, or things. Some of these mentions refer to the same person, place, or thing. Your job is to write questions that evaluate one's understanding of such references. Good questions are expected to link pronouns (she, her, him, his, their, etc.) or other mentions to people, places, or things to which they may refer. Do not ask questions that can be answered correctly without understanding the paragraph or having multiple answers. Avoid questions that do not link phrases referring to the same entity. For each of your questions, the answer should be one or more phrases in the paragraph, and it should be unambiguous.
Input: Passage: On arriving in McMurdo Sound on 29 January 1908, Nimrod's progress southward to the Discovery base at Hut Point was blocked by frozen sea. Shackleton decided to wait a few days in the hope that the ice would break up. During this delay, second officer Aeneas Mackintosh suffered an accident that led to the loss of his right eye. After emergency surgery by Marshall and Mackay, he was forced to relinquish his shore party place and go back to New Zealand with Nimrod. He recovered sufficiently to return with the ship in the following season.On 3 February Shackleton decided not to wait for the ice to shift but to make his headquarters at the nearest practicable landing place, Cape Royds. Late that evening the ship was moored, and a suitable site for the expedition's prefabricated hut was selected. The site was separated from Hut Point by 20 nautical miles (37 km; 23 mi) of sea, with no landward route to the south. Shackleton believed the party was "fortunate to get winter quarters as near as this to our starting point for the south."The following days were occupied with the landing of stores and equipment. This work was hampered by poor weather and by the caution of Captain England, who frequently took the ship out into the bay until ice conditions at the landing ground were in his view safer. The next fortnight followed this pattern, leading to sharp dissent between Shackleton and the captain. At one point, Shackleton asked England to stand down on the grounds that he was ill, but England refused. The task of unloading became, in Riffenburgh's description, "mind-numbingly difficult" but was finally completed on 22 February. Nimrod at last sailed away north, England unaware that ship's engineer Harry Dunlop was carrying a letter from Shackleton to the expedition's New Zealand agent, requesting a replacement captain for the return voyage next year. This knowledge was an open secret among the shore party; Marshall recorded in his diary that he was "glad to see the last of [England] ... whole thing damned disgrace to name of country!".
Output:
What was the first name of the man who had emergency surgery performed by Marshall and Mackay?