Power Electronics - Engineering

Q1:

Assertion (A): SUS is a PUT and avalanche diode connected between gate and cathode Reason (R): SBS has two SUS inbuilt together and connected in anti-parallel

A Both A and R are correct and R is correct explanation of A

B Both A and R correct but R is not correct explanation of A

C A is correct but R is wrong

D A is wrong but R is correct

ANS:B - Both A and R correct but R is not correct explanation of A

Please, can anyone explain it?