Assertion (A): White tin is an example of tetragonal system.
Reasoning (R): For a tetragonal system a = b = c and a = p = y `* 90^@`.

Options

A. Both (A) and (R) are true and (R) is the correct explanation of (A)
B. Both (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

Answer

c

Explanation

White tin is an example of tetragonal system and for a tetragonal system, `a = b ne c` and `alpha = beta = gamma =90^@`.