Final answer:
The best equivalent for cough syrup from the provided choices is 'cough mixture.' It is a term that specifically pertains to the liquid medication used to alleviate cough symptoms, unlike the other options which are either too broad or target different symptoms.
Step-by-step explanation:
Another term for cough syrup is cough mixture. Cold medicines are used by individuals with common cold, cough, or related conditions, and encompass a variety of medications. Despite the various substances combined in these medications, including antihistamines, decongestants, and cough suppressants, their effectiveness is often debated, particularly for pediatric use. Medications like dextromethorphan (DXM) may help decrease cough in adults, but are not necessarily effective in children. Other ingredients such as paracetamol or NSAIDs can also be part of cold medicine formulations to alleviate the symptoms.
When considering the correct answer from the given options, we do not include cold medicine as this term is broader and not specific to coughs, throat lozenge which is a solid medication, or nasal spray which is specific for nasal symptoms. Therefore, the best equivalent term for cough syrup among the provided choices is cough mixture.