To answer the research question (Does hydroxychloroquine or chloroquine help prevent COVID-19?), which of the following search strategies is the most effective and efficient one, as it returns the least number of articles but the retrieved article(s) provide good-quality scientific evidence to answer the question accurately?

	A.	Search query: (hydroxychloroquine OR chloroquine) AND (coronavirus OR COVID OR SARS-CoV-2) AND (prevent OR prophylactic OR prophylaxis). Search engine: https://pubmed.ncbi.nlm.nih.gov/
	B.	Search query: (hydroxychloroquine OR chloroquine) AND (coronavirus OR COVID OR SARS-CoV-2) AND (prevent OR prophylactic OR prophylaxis). Search engine: http://www.cochrane.org/
	C.	Search query: Does hydroxychloroquine or chloroquine help prevent COVID-19. Search engine: https://www.google.com/
	D.	Search query: Does hydroxychloroquine or chloroquine help prevent COVID-19. Search engine: https://medlineplus.gov/