Gelatin - Wikipedia, the free encyclopedia
Gelatin solutions show viscoelastic flow and streaming
birefringence.
That's a gelatin solution, though, so maybe not the gelatin itself?
Emulsion - Wikipedia, the free encyclopedia
Milk, vinaigrette, and cutting fluid will certainly flow.
Paste - Wikipedia, the free encyclopedia
Paste is a term for any very thick viscous fluid.
A fluid flows.
Paste (rheology), a substance that behaves as a solid and a liquid depending on applied load
That kind of a paste could flow.
Petroleum jelly - Wikipedia, the free encyclopedia
Petroleum jelly is a mixture of hydrocarbons, having a melting point usually within a few degrees of human body temperature, which is approximately 37 °C (99 °F).
[2] It is flammable only when heated to liquid, then the fumes will light
If you still call it jelly after it melts, then it flows.
It looks to me like more than one answer could be correct. I guess if I had to pick just one, it would be the emulsion.