Step 1: Define language isolate
A language isolate is a natural language with no demonstrable genealogical relationship to any other language family. Famous examples: Basque (Spain/France), Ainu (Japan), and Burushashki (Pakistan).
Step 2: Evaluate options
(A) Burushashki — spoken in northern Pakistan (Hunza, Nagar, Yasin valleys). A true language isolate.
(B) Mundari — part of the Austroasiatic (Munda) language family, not an isolate.
(C) Angami — a Tibeto-Burman language spoken in Nagaland, India. Not isolate.
(D) Kalasha — an Indo-Aryan language spoken in Chitral, Pakistan. Related to Dardic languages.
Thus, only Burushashki qualifies as a language isolate.
\[
\boxed{\text{Correct Answer: Burushashki (A)}}
\]
Examine the given data. The value of X is ________ (in integer). 
Eight students (P, Q, R, S, T, U, V, and W) are playing musical chairs. The figure indicates their order of position at the start of the game. They play the game by moving forward in a circle in the clockwise direction.
After the 1st round, the 4th student behind P leaves the game.
After the 2nd round, the 5th student behind Q leaves the game.
After the 3rd round, the 3rd student behind V leaves the game.
After the 4th round, the 4th student behind U leaves the game.
Who all are left in the game after the 4th round?
