Name a substance of which the specific resistance remains almost unchanged by the increase in temperature.

Explanation

**Step-by-Step Solution:**

1. **Understanding Specific Resistance:**
Specific resistance, or resistivity, is a property of a material that quantifies how strongly it resists the flow of electric current. It is denoted by the symbol ρ (rho).

2. **Effect of Temperature on Resistivity:**
For most materials, resistivity increases with temperature. This is because, as temperature rises, the atoms in the material vibrate more, causing more collisions with the charge carriers (electrons), which increases resistance.

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