31. Investigators want to examine whether a low-fat diet will improve mood in postmenopausal women. Women are randomized to receive (‘intervention group’) or not receive (‘control group’) the 14 week dietary intervention. Their mood is assessed at three time points: baseline, week 14 and week 18. What is this study design?
a. Quasi-experimental
b. Cross-sectional
c. Retrospective
d. Pre-post intervention
D . Pre-post intervention
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