A$5-1.$ Complete the following sentence in accordance with the guidance in TCPS $2$: $$Excluding women from research is $\_\_\_\_\_\_\_\_\_\_\_.$

Never ethically acceptable.

Ethically acceptable because this protects women from the risks of research.

Ethically unacceptable, unless the exclusion is related to the nature and scope of the research question.

Ethically necessary when a woman is pregnant or breastfeeding.