Four youngmen Raj, Prem, Ved and Ashok are friendly with four girls Sushma, Kushum, Vimla and Poonam.
Sushma and Vimla are friends.
Ved's girl friend does not like Sushma and Vimla.
Kusum does not care for Ved.
Prem's girl friend is friendly with Sushma. Sushma does not like Raj. Who is Poonam's boy friend ?

Answer: B. Ved

Sushma and Vimla are friends and Prem's girl friend is friendly with Sushma. This means that Prem's girl friend is Vimla. 
Ved's girl friend does not like Sushma and Vimal. So, she is either Kusum or Poonam. But Kusum does not care for Ved. So, Ved's girl friend is Poonam.
Sushma does not like Raj. So, Raj's girl friend is Kusum.
Clearly, Ashok's girl friend is Sushma.

So, Poonam's boy friend is Ved.