Assertion: The bulb filament is made up of tunsten. Reasoning: Tungsten has a very low melting point.

Both Assertion (A) and reasoning (R) are correct and R is the correct explanation of A. Both Assertion (A) and reasoning (R) are correct and but R is not the correct explanation of A. Assertion (A) is true but Reasoning (R) is not correct. Assertion (A) is not true but Reasoning (R) is correct.

Assertion (A) is true but Reasoning (R) is not correct.

Tungsten has very high melting point.