Here is the answer to the 5-mark question on common names and botanical families of the listed homoeopathic drugs:

(a) Rhus Toxicodendron (Poison Ivy) The plant belongs to the family Anacardiaceae. It contains urushiol, the allergen responsible for contact dermatitis. In homeopathy it is used for joint pains, rheumatism, and skin eruptions that are worse at rest and better with movement.

(b) Ledum Palustre (Marsh Tea / Wild Rosemary) Family Ericaceae. A low-growing bog shrub. Homoeopathically indicated for puncture wounds, insect stings, and conditions where the affected part feels cold yet is relieved by cold applications.

(c) Calendula (Marigold) Family Asteraceae (old name: Compositae). Native to the northern Mediterranean. Used topically and homoeopathically for wounds, lacerations, ulcers, burns, and to promote healing of open cuts.

(d) Symphytum (Comfrey / Bone-set) Family Boraginaceae. The common name "Bone-set" reflects its principal homoeopathic use — promoting union of fractured bones, treating injuries to periosteum and cartilage, and eye injuries from blunt trauma.

(e) Bryonia Alba (White Bryony) Family Cucurbitaceae. Distinct from Black Bryony (Dioscorea). The homoeopathic proving uses Bryonia alba. It is indicated for conditions where any movement aggravates — pleurisy, peritonitis, rheumatic joints — and the patient is better with rest and firm pressure.