The term meaning pregnancy and childbirth is:

• A. Obstetr/o
• B. Myel/o
• C. Onc/o
• D. Lymph/o

Answer: (A)

In medical terminology, terms related to pregnancy and childbirth use the combining form obstetr/o. This root carries the idea of pregnancy and delivery, seen in words like obstetrics and obstetrician, which are specifically about pregnancy, labor, and the postpartum period. The other roots point to different body parts or systems: myel/o refers to the spinal cord or bone marrow, onc/o to tumors, and lymph/o to the lymphatic system. So obstetr/o is the correct form when meaning pregnancy and childbirth.