Who was Kawaguchi ?

Kawaguchi Ekai (1866-1945) was a Japanese Buddhist monk from near Osaka. He studied Sanskrit at Oxford and then travelled to Tibet around 1900-1902, entering Lhasa in disguise as a Chinese monk. He brought back Buddhist texts and wrote Three Years in Tibet, which is his best-known work.

• A is wrong. He was Japanese. The Chinese identity was only his cover during the Tibet journey, and this is exactly why aspirants pick it.
• B is wrong on both counts: he was not Chinese, and travelling is not his primary identity.
• D is partly true, since he did travel widely, but the question asks who he was. His defining identity is as a monk, and the expected answer is C.

The core concept is the Buddhist exchange of manuscripts and scholarship between Japan, China, Tibet and India, a theme that links to Ancient and Medieval Indian history and to the cultural history of Buddhism in Tibet. For Mains, it also connects to how colonial-era travellers accessed Tibet and to the Buddhist textual heritage that moved across Asia.

Trap: assuming that a disguise describes the person's real nationality, which leads to option A.