**Core Concept:** Oral contraceptive pills (OCPs) are a type of hormonal contraceptive medication that contains estrogen and progesterone. They are commonly used to prevent pregnancy and can also have side effects related to hormonal imbalances.

**Why the Correct Answer is Right:** The correct answer is **D**. Oral contraceptive pills can lead to various side effects due to the synthetic hormones they contain. One such side effect is psychiatric symptoms, which can manifest as mood swings, depression, anxiety, and even psychosis in extreme cases. Additionally, OCPs can cause abdominal pain due to hormonal imbalances affecting the gastrointestinal system and the liver, which can lead to liver enzyme elevations and abdominal discomfort.

**Why Each Wrong Option is Incorrect:**

A. **Option A (OCPs causing only psychiatric symptoms):** While psychiatric symptoms can be a side effect of OCPs, they often coexist with abdominal pain as well. This is because the synthetic hormones can impact the gastrointestinal system, liver, and other organs involved in hormone regulation.

B. **Option B (OCPs causing only abdominal pain):** As mentioned earlier, OCPs can cause abdominal pain due to hormonal imbalances affecting the gastrointestinal system and liver. However, psychiatric symptoms are also common and should be considered when assessing the side effects of OCPs.

C. **Option C (Neither of the above):** The side effects of OCPs are not mutually exclusive. Psychiatric symptoms and abdominal pain are both common side effects of OCPs due to the synthetic hormones affecting various organ systems.

**Clinical Pearl:** It is essential for healthcare professionals to consider both psychiatric symptoms and abdominal pain when assessing patients taking OCPs. Regular monitoring and patient education can help manage these side effects and ensure patient satisfaction and adherence to contraceptive therapy.

**Correct Answer Explanation:** The correct answer (D) encompasses the core concept that OCPs can cause both psychiatric symptoms and abdominal pain due to their impact on various organ systems. This is a common side effect experienced by patients using OCPs and highlights the importance of comprehensive assessment and patient education when prescribing hormonal contraceptives.