Alnico is an alloy of . . . . . . .

Given below are two statements: one is labelled as Assertion $(A)$ and the other is labelled as Reason $(R)$. Consider a ferromagnetic material:
Assertion $(A)$: The individual atoms in a ferromagnetic material possess a magnetic dipole moment and interact with one another in such a way that they spontaneously align themselves forming domains.
Reason $(R)$: At high enough temperature, the domain structure of a ferromagnetic material disintegrates. Thus, magnetization will disappear at a high enough temperature known as the Curie temperature.
In the light of the above statements, choose the correct answer from the options given below:

When a diamagnetic substance is placed in a magnetic field, the magnetic induction inside the substance :-

Name the suitable material for an electromagnet.

Assertion: The ferromagnetic substance does not obey Curie's law.
Reason: At Curie point,a ferromagnetic substance starts behaving as a paramagnetic substance.

Diamagnetic substances are