Gst on outdoor catering service provided to Municipality authorities

The registered person 'A' gets a contract from municipalities authority for distribution of food packets to poor people at the location and time decided by Municipality authorities. The person 'A' gets the work done through some another person 'B', who is a caterer. The person 'B' cooks and packs and supplies the food packets and raises the invoices to 'A'.
what should be the gst rate on the invoices issued by the person 'A' to the Municipality authorities i.e. 5% without ITC or 18% with ITC.

Please suggest. Thanks in advance.

please clarify