If in a biology lesson a child asks about conceiving a child, the answer is not in biological terms, but in simple words.
Dad has a penis, and in order for mom to get pregnant, dad must insert his penis into mom’s female organ, it’s called a vagina, and in the end from Dad's penis should get white liquid into mom's vagina, thanks to which mom gets pregnant.
Should the teacher react to this somehow, or would such an answer in class also be appropriate?