Step 1: Recall the history of the term "Medical Sociology".
Step 1: Historical records in sociology credit the coining of the term to a specific individual in the late 19th century.
Step 2: Identify the individual.
Step 2: The term "medical sociology" is widely credited to have been first used in print by Dr. Charles McIntire in 1894. While the field was developed significantly later by figures like Talcott Parsons and Robert K. Merton, McIntire was the one who initially proposed the name for this specialization.
Step 3: Evaluate the options.
Step 3: Based on historical accounts, Charles McIntire is the correct answer for who *first proposed* the term. Robert K. Merton was a highly influential sociologist who contributed greatly to the field's development much later.