Assertion:safety fuses are made up of materials having a low melting pointreason: safety fuses should be resistent to to electric current

The assertion and the reason given are partially correct. Safety fuses are indeed made up of materials with a low melting point. This is because they are designed to melt or "blow" when the electrical current exceeds a safe level, thereby breaking the circuit and preventing potential damage or fire.

However, the reason given is not entirely accurate. It's not that safety fuses should be resistant to electric current, but rather they should be sensitive to excessive electric current. The purpose of a fuse is to allow a safe amount of current to flow, and to interrupt the circuit if the current becomes too high. This is achieved by using materials that melt easily, so the fuse will "blow" or break the circuit before the excessive current can cause damage or start a fire.