What do all acids have in common? A. They all contain oxygen
B. They are all dangerous
C. They are all salts
D. They all contain hydrogen

The  grandmother cell  is a hypothetical  neuronthat represents a complex but specific concept or object.[1]  it activates when a person "sees, hears, or otherwise sensibly discriminates"[2]  a specific entity, such as his or her grandmother. the term was in use at least as early as 1966 amongst staff and students in the department of experimental psychology, university of cambridge, england. a similar concept, that of the  gnostic neuron, was proposed two years later

What record? the question is incomplete

It can be classified based on its