Ans. is 'b' i.e., Microscopy plus radiology o District tuberculosis centre (DTC) is the nucleus of DTP o The function of DTC is to plan, organize and implement the DTP in the entire district, in association with general Health services. o When DTP activities (Sputum microscopy, chest X-ray, Anti-TB treatment) are introduced in an organized manner in a peripheral health institution (PHI), it is considered to be implemented PHI. o It is impoant that only such PHIS are selected for implementation of the programme, which are under the charge of qualified Medical officers.