Identify the leader who last met Gandhiji for about an hour and left him just few minutes before he was shot dead on January 30, 1948 while on his way to the prayer meeting.

On January 30, 1948, Sardar Vallabhbhai Patel met Gandhiji for about an hour and left just minutes before Gandhiji proceeded to the prayer meeting where he was assassinated. This meeting is documented in historical records as their final interaction. The other options are incorrect: John Ruskin was a philosopher who influenced Gandhi, Sarojini Naidu was a close associate, and Mahadev Desai was Gandhi's secretary who had died earlier in 1942.