Discussion
Assertion (A): Conservation work on historic masonry commonly specifies hydraulic lime rather than Portland cement.
Reason (R): A mortar stronger than the surrounding stone concentrates damage in the units rather than the joints.
Answer: A
Both are true and the reason gives the principle: the joint should be the sacrificial element, and a cement mortar reverses that arrangement in a wall built for something gentler. Compatibility matters more than strength in conservation work.
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