Four names have been given, out of which three are alike in some manner and one is different. Select the odd one.​​

Chandra Shekhar Singh – Former Prime Minister of India.

P V Narasimha Rao – Former Prime Minister of India.

H D Deve Gowda – Former Prime Minister of India.

Chaudhary Devi Lal – Former Deputy Prime Minister of India.

So, Chandra Shekhar Singh, P V Narasimha Rao, and H D Deve Gowda have all served as Prime Ministers of India.

But, Chaudhary Devi Lal was not a Prime Minister, he is a Deputy Prime Minister.

So, Odd One Out: Chaudhary Devi Lal

Thus, the correct option is: (d)