<prompt> Under the national TB programme, for a PHC to be called a PHC-R, requisite is:MicroscopyMicroscopy plus radiologyRadiologyNone of the above  <response>: Microscopy Facilities are available at all Primary health centres PHC. Those Primary health centres PHC with additional Radiology facility were called PHC-R R for Radiology under the national tuberculsis TB programme. Ref: Parks Textbook of Preventive and Socaial Medicine By K.Park, 18th Edition, Page 335. 