Final answer:
The information provided does not contain enough detail to answer the question about Maharaj and the devotee's trick accurately. However, it is clarified in Buddhism that the Buddha was prophesied to become either a holy man or the emperor of India.
Step-by-step explanation:
The trick that Maharaj played on the devotee is not provided in the information given. The details presented in the question do not point to a specific incident involving Maharaj and his devotee which could be related to tricks such as him being unable to speak, taking his glasses, switching his books, or being unable to hear. Without context, it's impossible to determine the accurate answer from the options provided.
In the reference provided, the mention of a student and a nightingale discussing things that are only known from books appears to be a different subject unrelated to the first question about Maharaj and his devotee.
Regarding the second question provided, according to Buddhist tradition, the prophecy foretold that when the Buddha grew up, he would become either a holy man or an emperor of India. There is no mention of the Buddha becoming a doctor according to such prophecies.