from sklearn.ensemble import RandomForestClassifier

def train_model(X_train, y_train):
    """
    Train a Random Forest Classifier.
    
    Args:
        X_train (pd.DataFrame): Training features.
        y_train (pd.Series): Training labels.
        
    Returns:
        model: Trained Random Forest model.
    """
    model = RandomForestClassifier(random_state=42)
    model.fit(X_train, y_train)
    return model