Which statement about marijuana and pregnancy is true?

• A. Marijuana crosses the placenta and can cause fetal effects.
• B. Marijuana cannot cross the placenta.
• C. Marijuana is beneficial during pregnancy.
• D. Marijuana exposure has no fetal effect.

Answer: (A)

The key idea is that cannabis use during pregnancy can affect the developing fetus because the active component, THC, crosses the placenta and reaches fetal circulation. This placental transfer means the fetus is exposed to the same psychoactive compound as the mother, which can interfere with normal development. While research has limitations, there is concern for adverse outcomes such as lower birth weight and potential neurodevelopmental issues that can emerge later in childhood, like attention and behavioral challenges. Given that there is no proven beneficial effect of marijuana during pregnancy, the statement that it crosses the placenta and can cause fetal effects accurately reflects current understanding. The other options conflict with what is known about placental transfer, potential harm, and lack of demonstrated benefits.