Final answer:
Excessive salivation, or ptyalism, is a common symptom that occurs primarily during the first trimester of pregnancy. While the exact cause is unknown, hormonal changes are believed to play a role. The condition usually subsides as the pregnancy progresses.
Step-by-step explanation:
The nurse should respond with option D: "Excess salivation commonly occurs during the first trimester, although the cause is unknown."
During pregnancy, hormonal changes can affect various body systems, including the salivary glands. Excess salivation, or ptyalism, is a common symptom that occurs primarily during the first trimester. The exact cause is unknown, but it is believed to be related to hormonal fluctuations.
Example: The increased production of saliva during the first trimester may be bothersome for some pregnant women, but it is usually a temporary condition that subsides as the pregnancy progresses.