Given below are two statements, one labeled as Assertion (A) and the other labeled as Reason (R). **Assertion (A):** IgG is the only class of immunoglobulin that can cross the human placenta to provide passive immunity to the fetus. **Reason (R):** The placental syncytiotrophoblast expresses specific neonatal Fc receptors (FcRn) that bind to the Fc region of IgG and facilitate its active transport. Select the correct answer using the codes given below:

Options:

• A: Both A and R are true and R is the correct explanation of A
• B: Both A and R are true but R is not the correct explanation of A
• C: A is true but R is false
• D: A is false but R is true

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