RJD president Lalu Prasad on Monday underwent a successful kidney transplant surgery in Singapore, his son and Bihar Deputy Chief Minister Tejashwi Yadav said.

Yadav, who has been by his ailing father's side for the past few days, expressed delight that both Prasad and Rohini Acharya, his elder sister who has donated one of her kidneys to the 74-year-old, were fine after the surgery.