What is the most dangerous side effect of anti-neoplastic drugs?

Rationale: A. Hair loss is a common and visible side effect of many anti-neoplastic drugs, but it is not life-threatening. While it can affect self-esteem and quality of life, it does not endanger the patient’s health. B. Electrolyte imbalances can occur due to chemotherapy, vomiting, or tumor lysis syndrome, and they require monitoring and correction. However, they are usually manageable with fluids and medications and are not the primary life-threatening risk of anti-neoplastic therapy. C. Bone marrow suppression (myelosuppression) is the most dangerous side effect of anti-neoplastic drugs because it reduces the production of white blood cells, increasing the risk of infection; red blood cells, causing anemia and decreased oxygen delivery; and platelets, increasing the risk of bleeding. Severe myelosuppression can result in life-threatening infections, hemorrhage, or hypoxia, making it the most critical adverse effect to monitor and manage. D. Although common and distressing, nausea and vomiting are generally manageable with modern antiemetics and are rarely directly life-threatening.