Assertion $(A)$: White tin is an example of a tetragonal system.
Reasoning $(R)$: For a tetragonal system,$a=b=c$ and $\alpha=\beta=\gamma \neq 90^{\circ}$. The correct answer is
Reasoning $(R)$: For a tetragonal system,$a=b=c$ and $\alpha=\beta=\gamma \neq 90^{\circ}$. The correct answer is
- A$(A)$ and $(R)$ are true and $(R)$ is the correct explanation of $(A)$.
- BBoth $(A)$ and $(R)$ are true and $(R)$ is not the correct explanation of $(A)$.
- C$(A)$ is true but $(R)$ is not true.
- D$(A)$ is not true but $(R)$ is true.
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