Assertion (A) : White tin is an example of tetragonal system. Reasoning (R): For a tetragonal system $a=b=c$ and $\alpha =\beta = \gamma \neq 90^{\circ}$. The correct answer is :

Question

The correct answer is :

(1) (A) and (R) are true and (R) is the correct explanation of (A)

(2) Both  (A) and (R) are true and (R) is not the correct explanation of (A)

(3) (A) is true but (R) is not true

(4) (A) is not true but (R) is  true