Systematic reviews and meta analysis – UGC NET Question

Statements A, B, C, D and E describe core features and concerns of systematic reviews and meta-analyses. A is true because systematic reviews use explicit protocols for searching and synthesising evidence, and B is correct that meta-analysis statistically combines results. C is accurate in emphasising transparent inclusion and exclusion criteria, while D rightly points to publication bias as a threat. E is also true since effect sizes are typically weighted by sample size or precision, whereas F is false because narrative reviews vary widely in rigour and often lack the structured protocol of systematic reviews.

Option A:
Option A is correct as it brings together all the statements that match standard descriptions of systematic reviews and meta-analyses and excludes F, which overstates the rigour of narrative reviews. It therefore contains all and only the true statements.

Option B:
Option B wrongly adds statement F, implying that narrative reviews always match the rigour of systematic approaches. In reality, many narrative reviews are selective and unsystematic. Including F makes the combination invalid.

Option C:
Option C omits statement B, ignoring the defining statistical element of meta-analysis, namely combining quantitative results across studies. Without B, the explanation fails to capture a key aspect of research synthesis.

Option D:
Option D excludes statement A and thus neglects the procedural foundation of systematic reviews. Although it includes B, C, D and E, such an omission makes the description incomplete and the option incorrect.