Assertion: Stock Exchange enables investors to know the true worth of their holdings at any time.
Reasoning: Stock Exchange publishes price quotation of the shares of the companies that have been listed with them after thorough analysis of demand and supply position.

Both Assertion (A) and reasoning (R) are correct and R is the correct explanation of A.

Facilitates evaluation of securities: Stock exchange is useful for the evaluation of industrial securities. It publishes price quotation of the shares of the companies that have been listed with them after thorough analysis of demand and supply position. This enables investors to know the true worth of their holdings at any time.