This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Social & Preventive Medicine
Which of the following defines relation between quality assurance (QA), quality control (QC), internal quality assurance (lQA) & external quality assurance (EQA) 
Select and explain. 
A. QA = QC + IQA + EQA, B. QC = QA + IQA - EQA, C. QC = QA + IQA + EQA, D. QA = QC + IQA - EQA
A: QA = QC + IQA + EQA
Answer: A: QA = QC + IQA + EQA 
Explanation: QUALITY ASSURANCE: (QA) A programme designed to monitor and evaluate the ongoing and overall quality of the total testing process, including preanalytical analytical and post analytical phases of testing QUALITY CONTROL: (QC) A process in the laboratory designed to monitor the analytical phase of testing procedure to ensure that the tests are working properly