Select the true statement regarding lymphomas.

The statement regarding chronic lymphomas responding well to chemotherapy is grounded in the treatment paradigm for these diseases. Chronic lymphomas, such as Chronic Lymphocytic Leukemia (CLL) and some types of Non-Hodgkin Lymphoma (NHL), can often be managed effectively with chemotherapy, targeted therapies, and immunotherapies. These treatment strategies aim to control the disease and extend the patient's life while managing symptoms, especially since chronic lymphomas typically present with a more indolent course compared to aggressive forms of the disease.

On the other hand, assessing the other statements reveals significant distinctions. The classification of stage III lymphomas involves more extensive disease and often indicates that the lymphoma has spread beyond its original location, making them generally less treatable compared to localized stages. While lymphomas can occur in children, they are more frequently seen in adults, particularly non-Hodgkin lymphoma. Lastly, acute leukemias, particularly Acute Lymphoblastic Leukemia (ALL) and Acute Myeloid Leukemia (AML), indeed have a higher incidence in children, but also occur in adults, thus making the statement about their primary occurrence in childhood somewhat misleading. This context highlights the complexities and variances within hematologic malignancies.