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What is the transition temperature region required during the preparation of glass-ceramic material, lithium disilicate in ^oC?

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What is the transition temperature region required during the preparation of glass-ceramic material, lithium disilicate in ^oC?

(a) -25 to 0

(b) 0 to 25

(c) 25 100

(d) 300 to 500

The question was posed to me in an online interview.

My query is from Crystallization of Solutions, Melts, Glasses and Gels in division Preparative Methods of Solid State Chemistry

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The correct option is (d) 300 to 500

For explanation: Transition temperature is the temperature region where the polymer transition occurs from a hard, glassy material to a soft, rubbery material. Transition temperature required during the preparation of lithium disilicate is 450^oC and on heating at 500 to 700^oC crystallization of LI2Si2O5 occurs readily after few hours.

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