(d) A teacher taking classes in a government school.
A government school is a registered organisation with fixed pay, job security, and service rules — all features of the organised sector.
The organised sector includes enterprises registered with the government, where workers receive fixed salaries, job security, and follow labour laws. A government school teacher fits all these criteria. The other options (farmer, handloom weaver, headload worker) are typical unorganised sector workers with no fixed pay or job security.