Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE Participants_in_Events (Participant_ID VARCHAR, Event_ID VARCHAR)
TABLE: CREATE TABLE services (Service_Type_Code VARCHAR, service_id VARCHAR)
TABLE: CREATE TABLE EVENTS (service_id VARCHAR, Event_ID VARCHAR)
TABLE: CREATE TABLE participants (Participant_ID VARCHAR)

### Question ###
Which service id and type has the least number of participants?

### Accurate SQL ###

SELECT T3.service_id, T4.Service_Type_Code FROM participants AS T1 JOIN Participants_in_Events AS T2 ON T1.Participant_ID = T2.Participant_ID JOIN EVENTS AS T3 ON T2.Event_ID = T3.Event_ID JOIN services AS T4 ON T3.service_id = T4.service_id GROUP BY T3.service_id ORDER BY COUNT(*) LIMIT 1